- Published on
by Mark Kovacs, PhD, FACSM, CSCS
Introduction: Recovery as a Cornerstone of Durability
Recovery is no longer an afterthought in performance or health. It is one of the most important drivers of durability - the ability to sustain performance and health across decades. I have had the fortune of working with heat and cold therapies first as an athlete at the Australian Institute of Sport then later as a researcher in environmental labs at both Auburn University and the University of Alabama. When I was working at the United States Tennis Association, I was fortunate to oversee the National Sport Science Committee with some of the top researchers, academics and clinicians in the world and we put out one of the first edited books on Recovery strategies for athletes back in 2009. It was great to recently read a new review published in Sports Medicine (Rousse et al., 2025) took a deep dive into how cold, heat, contrast, and hypoxia therapies influences recovery from exercise-induced muscle damage (EIMD).This article will unpacks those findings and provides context for how they can be applied beyond the lab. This will be beneficial for athletes to executives and anyone seeking to extend their healthspan.
The Science of Exercise-Induced Muscle Damage (EIMD)
Hard training - whether it’s heavy resistance work, sprint intervals, or explosive plyometrics - produces microtears in muscle fibers and will increase minflammation. This is not inherently negative; in fact, it’s necessary for adaptation. But it triggers a cascade of changes:
.
Cold Therapy: The Most Studied, but Still Controversial
Mechanisms
Cold therapy (ice, cold-water immersion, cryotherapy) reduces tissue temperature and blood flow. This can decrease metabolic demand and blunt secondary muscle damage. It may also dampen inflammatory signaling (e.g., NF-κB, TNF-α). However, the reduction in blood flow can have a negative impact on certain aspects of recovery.
Findings from the Review
Cold therapy can help soreness and perceived recovery, but its role in accelerating physiological repair is debated. Dose matters. Short, light cooling may be ineffective; too much cooling could impair adaptation.
Recovery is no longer an afterthought in performance or health. It is one of the most important drivers of durability - the ability to sustain performance and health across decades. I have had the fortune of working with heat and cold therapies first as an athlete at the Australian Institute of Sport then later as a researcher in environmental labs at both Auburn University and the University of Alabama. When I was working at the United States Tennis Association, I was fortunate to oversee the National Sport Science Committee with some of the top researchers, academics and clinicians in the world and we put out one of the first edited books on Recovery strategies for athletes back in 2009. It was great to recently read a new review published in Sports Medicine (Rousse et al., 2025) took a deep dive into how cold, heat, contrast, and hypoxia therapies influences recovery from exercise-induced muscle damage (EIMD).This article will unpacks those findings and provides context for how they can be applied beyond the lab. This will be beneficial for athletes to executives and anyone seeking to extend their healthspan.
The Science of Exercise-Induced Muscle Damage (EIMD)
Hard training - whether it’s heavy resistance work, sprint intervals, or explosive plyometrics - produces microtears in muscle fibers and will increase minflammation. This is not inherently negative; in fact, it’s necessary for adaptation. But it triggers a cascade of changes:
- Reduced performance: Temporary drops in strength and power.
- Limited range of motion: Stiffness and tightness.
- Inflammation and swelling: Driven by cytokines and immune cell infiltration.
- Muscle soreness (DOMS): Often peaking 24–72 hours post-exercise.
- Blood markers of stress: Increases in creatine kinase, myoglobin, and inflammatory cytokines.
.
Cold Therapy: The Most Studied, but Still Controversial
Mechanisms
Cold therapy (ice, cold-water immersion, cryotherapy) reduces tissue temperature and blood flow. This can decrease metabolic demand and blunt secondary muscle damage. It may also dampen inflammatory signaling (e.g., NF-κB, TNF-α). However, the reduction in blood flow can have a negative impact on certain aspects of recovery.
Findings from the Review
- Widespread use, but mixed outcomes. Of 37 studies analyzed, cold therapy produced beneficial effects in some areas but neutral outcomes in many others.
- Cold water immersion (CWI): Effective when protocols are long enough (~10–11 minutes at ~10°C/50°F), especially immediately post-exercise.
- Cryotherapy (Whole Body Cooling WBC/Partial Body Cooling PBC): Short exposures (−60°C to −195°C for 2–3 min) improved autonomic balance and reduced soreness.
- Localized ice packs: Inconsistent effects — sometimes blunting pain, but with little impact on performance recovery.
Cold therapy can help soreness and perceived recovery, but its role in accelerating physiological repair is debated. Dose matters. Short, light cooling may be ineffective; too much cooling could impair adaptation.
Heat Therapy: Emerging as a Strong Candidate
Mechanisms
Heat increases blood flow, nutrient delivery, and metabolic activity. It activates heat shock proteins (HSPs), which protect cells, reduce oxidative stress, and stimulate repair pathways.
Findings
Heat therapy, especially systemic approaches like hot water immersion/sauna may be the most effective single environmental stressor for restoring muscle function after damage.
Contrast Therapy: The Promise of Alternating Hot and Cold
Mechanisms
Contrast therapy alternates vasodilation (heat) and vasoconstriction (cold), producing a “pumping” effect that may improve circulation and metabolite clearance.
Findings
Contrast therapy is promising but under-researched. It may offer synergistic benefits by combining advantages of cold and heat, but protocols vary widely.
Mechanisms
Heat increases blood flow, nutrient delivery, and metabolic activity. It activates heat shock proteins (HSPs), which protect cells, reduce oxidative stress, and stimulate repair pathways.
Findings
- Hot water immersion (HWI): Consistently showed positive effects on muscle function recovery when water >38°C/100°F for 15–45 minutes.
- Local heating (wraps, pads, ultrasound): Mixed results, likely due to insufficient depth or duration of heating.
- Systemic vs. local: Systemic heat appears more effective than superficial local heating.
Heat therapy, especially systemic approaches like hot water immersion/sauna may be the most effective single environmental stressor for restoring muscle function after damage.
Contrast Therapy: The Promise of Alternating Hot and Cold
Mechanisms
Contrast therapy alternates vasodilation (heat) and vasoconstriction (cold), producing a “pumping” effect that may improve circulation and metabolite clearance.
Findings
- Only five studies met criteria - far fewer than cold or heat therapy.
- Most used contrast water immersion (CWI/heat cycles) for 6–24 minutes.
- Evidence suggests reductions in swelling and soreness, and improvements in range of motion.
Contrast therapy is promising but under-researched. It may offer synergistic benefits by combining advantages of cold and heat, but protocols vary widely.
Hypoxia Therapy: A Surprising New Player
Mechanisms
Hypoxia is reduced oxygen availability. Continuous hypoxia (like living at altitude) can impair muscle regeneration by suppressing mTOR. But intermittent hypoxia - brief exposures alternating with normal oxygen - may activate AMPK, driving new myofiber formation and limiting fibrosis.
Findings
Hypoxia therapy, especially in the form of BFR, shows early promise for reducing inflammation and aiding recovery, but evidence is still limited compared to cold or heat.
Practical Lessons: Dose, Timing, and Individualization Matter
The review highlighted a crucial point: the effectiveness of these therapies depends on how they’re applied.
From Athletes to Executives: Why This Matters for Durability
Recovery is not just about bouncing back for the next workout. It’s about maintaining function across decades. The same stressors that help athletes recover from training may help executives recover from long workdays, frequent travel, or cognitive strain.
Gaps and Future Directions
The review also underscores what we don’t yet know:
Practical Recommendations
Conclusion: Recovery as Longevity Training
This review makes one message clear: recovery is not passive - it’s trainable. Cold, heat, contrast, and hypoxia therapies are tools, but their effectiveness depends on the “dose” and the individual.
For the durability mindset, this means:
Mechanisms
Hypoxia is reduced oxygen availability. Continuous hypoxia (like living at altitude) can impair muscle regeneration by suppressing mTOR. But intermittent hypoxia - brief exposures alternating with normal oxygen - may activate AMPK, driving new myofiber formation and limiting fibrosis.
Findings
- Seven studies explored local hypoxia, often via blood flow restriction (BFR) techniques.
- Benefits included reduced inflammation and enhanced recovery of function.
- Populations were mostly male and trained, limiting generalizability.
Hypoxia therapy, especially in the form of BFR, shows early promise for reducing inflammation and aiding recovery, but evidence is still limited compared to cold or heat.
Practical Lessons: Dose, Timing, and Individualization Matter
The review highlighted a crucial point: the effectiveness of these therapies depends on how they’re applied.
- Cold therapy: Needs sufficient exposure (~10 min at 10°C/50°F). Too much may blunt adaptation.
- Heat therapy: Works best when applied systemically, at high enough temperatures (>38°C/100°F).
- Contrast therapy: Likely effective for swelling and soreness, but protocols need standardization.
- Hypoxia therapy: Promising, but requires precise protocols to avoid harm.
From Athletes to Executives: Why This Matters for Durability
Recovery is not just about bouncing back for the next workout. It’s about maintaining function across decades. The same stressors that help athletes recover from training may help executives recover from long workdays, frequent travel, or cognitive strain.
- Cold exposure can improve autonomic balance, stress tolerance, and perceived recovery.
- Heat therapy overlaps with sauna research, which is strongly linked to cardiovascular and longevity benefits.
- Contrast therapy may support vascular health and mobility.
- Hypoxia therapy could one day be harnessed not only for muscle repair but also for metabolic health.
Gaps and Future Directions
The review also underscores what we don’t yet know:
- Female athletes are under-studied. Most participants were male.
- Few studies look at combined therapies. What happens if we pair hypoxia with heat, or contrast therapy with BFR?
- Long-term outcomes are missing. Most studies track recovery for days, not months. We need to know if these methods reduce injuries or extend careers.
Practical Recommendations
- Cold Therapy
- Use sparingly when adaptation is the goal, but beneficial for managing soreness in congested schedules.
- Protocol: 10 min immersion at 10°C/50°F immediately post-session.
- Heat Therapy
- Ideal for recovery days or after submaximal training.
- Protocol: 15–30 min hot water immersion at 38–42°C/100-108°F.
- Contrast Therapy
- Useful after games or tournaments to reduce swelling.
- Protocol: 1–3 min hot (38–42°C/100-108°F), 1–3 min cold (8–15°C/46-59°F), repeat for 15–20 min.
- Hypoxia Therapy (BFR)
- Should only be applied under professional supervision.
- Promising for inflammation control and functional recovery.
Conclusion: Recovery as Longevity Training
This review makes one message clear: recovery is not passive - it’s trainable. Cold, heat, contrast, and hypoxia therapies are tools, but their effectiveness depends on the “dose” and the individual.
For the durability mindset, this means:
- Use these tools deliberately, not reflexively.
- Match the therapy to the goal: soreness management, adaptation, or functional restoration.
- Recognize that recovery is not just about the next workout - it’s about building a resilient system for the next decade.
- Published on
by Dr. Mark Kovacs
Introduction
In the relentless pursuit of athletic excellence, small gains matter. And in life, when the goal is better health, resilience, and longevity - those small, consistent advantages may be even more important. Every extra recovery tool, every new technology, and every tweak in training can yield meaningful returns. One therapy that has generated both enthusiasm and skepticism over the years is Hyperbaric Oxygen Therapy (HBOT). HBOT is the practice of administering oxygen (most studies use 100% oxygen) at elevated atmospheric pressures to dramatically increase tissue oxygenation. Advocates praise its potential to accelerate recovery, enhance performance, and even reverse age-related cellular decline. But what does the science actually tell us?
Before we explore the latest evidence, I want to share my background with HBOT and why this topic has remained a component of my recommendations for certain purposes for nearly three decades.
As an athlete in Australia during the 1990s, I directly observed HBOT research as part of the Australian Institute of Sport (AIS), where protocols were being trialed to speed recovery from injuries. At that time, HBOT was used for musculoskeletal issues, particularly sprained ankles, and was incorporated into post-match recovery protocols by several Australian Rules Football (AFL) clubs. In the early 2000s, interest in HBOT surged globally, though enthusiasm waned as some early short-term studies failed to confirm the anecdotal benefits many athletes and coaches reported.
During my academic and research career, I worked closely with environmental and NASA physiologists, studying how supplemental oxygen could influence mitochondrial function, red blood cell mass, plasma volume, and inflammatory markers such as C-Reactive Protein (CRP) and interleukin-6 (IL-6). This foundation shaped my scientific approach to evaluating HBOT - not just as a performance tool, but as a therapy with potential healthspan and recovery applications.
In my professional roles, including working with NBA teams, elite professional tennis players, and executives seeking to extend their healthspan, I have integrated HBOT into recovery and longevity protocols. These experiences, combined with decades of research and practical application, provide a unique perspective on both the promises and the limitations of HBOT.
It is also critical to emphasize safety. Because of the high oxygen concentrations used, HBOT carries a fire risk and must always be implemented with rigorous safety protocols.
With this context, let’s turn to the science. Below, I will review recent peer-reviewed studies on HBOT’s role in athletic recovery, human performance, and longevity. This highlights were research is promising and also where it still falls short.
In the relentless pursuit of athletic excellence, small gains matter. And in life, when the goal is better health, resilience, and longevity - those small, consistent advantages may be even more important. Every extra recovery tool, every new technology, and every tweak in training can yield meaningful returns. One therapy that has generated both enthusiasm and skepticism over the years is Hyperbaric Oxygen Therapy (HBOT). HBOT is the practice of administering oxygen (most studies use 100% oxygen) at elevated atmospheric pressures to dramatically increase tissue oxygenation. Advocates praise its potential to accelerate recovery, enhance performance, and even reverse age-related cellular decline. But what does the science actually tell us?
Before we explore the latest evidence, I want to share my background with HBOT and why this topic has remained a component of my recommendations for certain purposes for nearly three decades.
As an athlete in Australia during the 1990s, I directly observed HBOT research as part of the Australian Institute of Sport (AIS), where protocols were being trialed to speed recovery from injuries. At that time, HBOT was used for musculoskeletal issues, particularly sprained ankles, and was incorporated into post-match recovery protocols by several Australian Rules Football (AFL) clubs. In the early 2000s, interest in HBOT surged globally, though enthusiasm waned as some early short-term studies failed to confirm the anecdotal benefits many athletes and coaches reported.
During my academic and research career, I worked closely with environmental and NASA physiologists, studying how supplemental oxygen could influence mitochondrial function, red blood cell mass, plasma volume, and inflammatory markers such as C-Reactive Protein (CRP) and interleukin-6 (IL-6). This foundation shaped my scientific approach to evaluating HBOT - not just as a performance tool, but as a therapy with potential healthspan and recovery applications.
In my professional roles, including working with NBA teams, elite professional tennis players, and executives seeking to extend their healthspan, I have integrated HBOT into recovery and longevity protocols. These experiences, combined with decades of research and practical application, provide a unique perspective on both the promises and the limitations of HBOT.
It is also critical to emphasize safety. Because of the high oxygen concentrations used, HBOT carries a fire risk and must always be implemented with rigorous safety protocols.
With this context, let’s turn to the science. Below, I will review recent peer-reviewed studies on HBOT’s role in athletic recovery, human performance, and longevity. This highlights were research is promising and also where it still falls short.
1. HBOT and Athlete Recovery: Mixed Evidence in Elite Youth Footballers
A recent double‑blind, randomized controlled trial involving elite youth football players (mean age ~17 years) investigated whether a single 60‑minute session of HBOT after a 90‑minute match could influence biochemical markers, performance outcomes, or perceived recovery (measured via the Hooper Index).
Key Findings:
While a single HBOT session doesn’t improve objective markers or performance in youth footballers, it may positively influence subjective recovery perceptions. The authors suggest that longer or repeated sessions and larger sample sizes may be necessary to uncover meaningful effects.
2. Broader Evidence: Pre-, Post- and Intra-Exercise HBOT
A 2021 systematic review and meta‑analysis spanning 10 studies (166 participants) assessed the effects of HBOT administered before, during, or after exercise:
Summary:
Most current evidence suggests no significant performance or recovery benefits when HBOT is applied before or after exercise. Promising effects during exercise require further empirical validation.
3. Emerging Insights: Mild HBOT and Muscle Fatigue Timing
A 2024 study examined mild hyperbaric oxygen therapy (MHOT) - a lower-pressure variant (1.25 ATA, 26%–28 % oxygen) - among male university athletes experiencing muscle fatigue.
Early signs point to MHOT's potential, particularly when sessions are tailored by timing and frequency. However, more data is needed before practical recommendations can be made.
A recent double‑blind, randomized controlled trial involving elite youth football players (mean age ~17 years) investigated whether a single 60‑minute session of HBOT after a 90‑minute match could influence biochemical markers, performance outcomes, or perceived recovery (measured via the Hooper Index).
Key Findings:
- Biochemical Markers: Muscle damage indicators—myoglobin, creatine kinase (CK), lactate dehydrogenase (LDH), ALT, AST—increased post-match in both HBOT and placebo groups, with no significant between‑group differences at 1 hour or 12 hours post-intervention.
- Performance Measures: Speed (5‑m, 10‑m, 20‑m) and jump metrics (squat jump, CMJ, CMJ with arm swing) showed no improvement attributable to HBOT.
- Perceived Recovery: The HBOT group reported significantly lower Hooper Index scores (indicating better perceived recovery) one hour post‑session (8.6 ± 2.41 vs. 11.0 ± 3.23; p = 0.012).
While a single HBOT session doesn’t improve objective markers or performance in youth footballers, it may positively influence subjective recovery perceptions. The authors suggest that longer or repeated sessions and larger sample sizes may be necessary to uncover meaningful effects.
2. Broader Evidence: Pre-, Post- and Intra-Exercise HBOT
A 2021 systematic review and meta‑analysis spanning 10 studies (166 participants) assessed the effects of HBOT administered before, during, or after exercise:
Summary:
- Pre‑Exercise HBOT: No significant effect on subsequent performance.
- Post‑Exercise HBOT: No notable advantage in recovery metrics.
- Intra‑Exercise HBOT: Some individual studies indicated improved muscle endurance; however, heterogeneity prevented robust meta‑analysis.
Most current evidence suggests no significant performance or recovery benefits when HBOT is applied before or after exercise. Promising effects during exercise require further empirical validation.
3. Emerging Insights: Mild HBOT and Muscle Fatigue Timing
A 2024 study examined mild hyperbaric oxygen therapy (MHOT) - a lower-pressure variant (1.25 ATA, 26%–28 % oxygen) - among male university athletes experiencing muscle fatigue.
- The study explored both single and repeated MHOT sessions.
- Findings suggest potential timing‑dependent benefits in recovery from muscle fatigue, though precise outcomes and statistical details were not fully disclosed in the summary.
Early signs point to MHOT's potential, particularly when sessions are tailored by timing and frequency. However, more data is needed before practical recommendations can be made.
4. Regenerative & Anti-Aging Potential of HBOT
Beyond sports, HBOT is emerging as a tool for regenerative therapy and combating aging-related declines. A 2024 review outlines these anti-aging and regenerational mechanisms:
Mechanisms Highlighted:
HBOT holds significant promise beyond athletic recovery, particularly in regenerative and anti-aging domains. Mechanistic insights suggest far-reaching benefits, though clinical validation is still emerging.
5. Enhancing Physical Performance and Cardiac Perfusion in Aging Adults
A prospective, randomized controlled trial conducted between 2016 and 2020 assessed intermittent HBOT’s effect on physical performance and cardiac perfusion in sedentary older adults:
Beyond sports, HBOT is emerging as a tool for regenerative therapy and combating aging-related declines. A 2024 review outlines these anti-aging and regenerational mechanisms:
Mechanisms Highlighted:
- Angiogenesis & Collagen Production: HBOT enhances vascular growth and collagen synthesis, aiding tissue repair.
- Gene Expression & Cellular Senescence: It may alter gene expression, delay cell aging, and even lengthen telomeres.
- Hyperoxic‑Hypoxic Paradox: Controlled cycles of high oxygen exposure can induce protective and reparative cellular responses via HIF-1 pathways, and immune modulation.
- Tissue Regeneration and Cognitive Benefits: Preclinical and early human studies show promise for neuroplasticity, stem cell recruitment, and brain function enhancements.
HBOT holds significant promise beyond athletic recovery, particularly in regenerative and anti-aging domains. Mechanistic insights suggest far-reaching benefits, though clinical validation is still emerging.
5. Enhancing Physical Performance and Cardiac Perfusion in Aging Adults
A prospective, randomized controlled trial conducted between 2016 and 2020 assessed intermittent HBOT’s effect on physical performance and cardiac perfusion in sedentary older adults:
- Maximal oxygen consumption (VO₂ Max) increased significantly overall and per kilogram of body weight.
- VO₂ at the first ventilatory threshold (VO₂ VT₁) improved by ~160 ml/min, with a moderate effect size.
- Cardiac blood flow (MBF) and cardiac blood volume (MBV) were notably elevated, with large effect sizes.
6. Reversing Cellular Aging: Telomere Elongation and Senescent Cell Reduction
A landmark peer-reviewed study published in the journal Aging evaluated HBOT’s impact on key hallmarks of biological aging in healthy adults aged 64 and older:
7. Summary Table: HBOT Efficacy Across Domains
Application
Evidence Summary
Single HBOT after sport (youth)
No improvement in performance or biomarkers; improved perceived recovery only
Pre/Post-Exercise HBOT
No significant effect on performance or recovery across multiple studies
Intra-Exercise HBOT
Potential muscle endurance benefit; needs further confirmation
MHOT (mild HBOT)
Promising in fatigue timing recovery; preliminary evidence
Exercise-Induced Muscle Injury
Effective for structural injury recovery per early reports
Regenerative / Anti-Aging
Mechanistically promising; early data supports angiogenesis, anti-senescence effects
8. Practical Takeaways for Athletes & Coaches
A landmark peer-reviewed study published in the journal Aging evaluated HBOT’s impact on key hallmarks of biological aging in healthy adults aged 64 and older:
- Participants underwent 60 daily HBOT sessions over 90 days, with no concurrent lifestyle or medication changes.
- Results showed over 20% increase in telomere length in immune cells (especially B cells).
- Senescent cell counts decreased by 10–37%, particularly among T helper and cytotoxic T cells.
7. Summary Table: HBOT Efficacy Across Domains
Application
Evidence Summary
Single HBOT after sport (youth)
No improvement in performance or biomarkers; improved perceived recovery only
Pre/Post-Exercise HBOT
No significant effect on performance or recovery across multiple studies
Intra-Exercise HBOT
Potential muscle endurance benefit; needs further confirmation
MHOT (mild HBOT)
Promising in fatigue timing recovery; preliminary evidence
Exercise-Induced Muscle Injury
Effective for structural injury recovery per early reports
Regenerative / Anti-Aging
Mechanistically promising; early data supports angiogenesis, anti-senescence effects
8. Practical Takeaways for Athletes & Coaches
- HBOT isn’t a recovery panacea. A single post-exercise session doesn’t significantly speed up muscle repair or enhance performance in well-trained youth athletes.
- Perceived recovery improves. Athletes may feel better after HBOT - this psychological benefit shouldn't be dismissed.
- Explore longer or repeated protocols. The robustness of HBOT likely depends on session length, dosage, frequency, and timing.
- Context matters. HBOT may be more effective for recovery from actual tissue damage rather than general fatigue.
- Intra-exercise administration is intriguing. More research could unlock this avenue as a performance ergogenic tool.
- Longevity potential is compelling. Athletes interested in long-term health and aging may find HBOT’s regenerative mechanisms especially attractive.
- Be mindful of evidence limitations. Many findings remain preliminary; practitioners should balance innovation with caution.
Conclusion
Hyperbaric Oxygen Therapy occupies a fascinating niche at the intersection of science, sport, and longevity. While the evidence shows limited performance or biochemical recovery benefit from single sessions, there is consistent improvement in subjective recovery, and strong indications that better outcomes may arise from optimized protocols or specific applications - especially in regeneration and aging.
For athletes and coaches looking to explore HBOT as part of a recovery arsenal, the message is clear: temper expectations, track responses, and prioritize evidence-informed protocols. For those invested in human performance sustainability and healthy longevity, HBOT offers an exciting frontier - just one that still needs more rigorous exploration from a protocol perspective.
References and Further Readings:
https://www.sciencedirect.com/science/article/pii/S1728869X24000406 https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2024.1483142/full https://www.sciencedirect.com/science/article/abs/pii/S000399932500824X https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2021.791872/full https://bmcgeriatr.biomedcentral.com/articles/10.1186/s12877-024-05146-3
https://www.aging-us.com/article/202188/text
Hyperbaric Oxygen Therapy occupies a fascinating niche at the intersection of science, sport, and longevity. While the evidence shows limited performance or biochemical recovery benefit from single sessions, there is consistent improvement in subjective recovery, and strong indications that better outcomes may arise from optimized protocols or specific applications - especially in regeneration and aging.
For athletes and coaches looking to explore HBOT as part of a recovery arsenal, the message is clear: temper expectations, track responses, and prioritize evidence-informed protocols. For those invested in human performance sustainability and healthy longevity, HBOT offers an exciting frontier - just one that still needs more rigorous exploration from a protocol perspective.
References and Further Readings:
https://www.sciencedirect.com/science/article/pii/S1728869X24000406 https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2024.1483142/full https://www.sciencedirect.com/science/article/abs/pii/S000399932500824X https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2021.791872/full https://bmcgeriatr.biomedcentral.com/articles/10.1186/s12877-024-05146-3
https://www.aging-us.com/article/202188/text
- Published on
By Dr. Mark Kovacs, PhD, FACSM
Human Performance Strategist, Wellness and Longevity Expert
Human Performance Strategist, Wellness and Longevity Expert
Jet lag isn’t just an inconvenience. For high performers, it's a scientifically measurable form of biological disruption. It impairs physical performance, slows reaction time, clouds mental sharpness, and affects hormonal and metabolic health. As someone who’s coached Olympic champions, advised global business leaders, and spent the last two decades immersed in the science of performance, I know one thing: jet lag must be taken seriously if we want to maximize durability, healthspan, and elite function across the lifespan. I have worked in multiple sports, but the three that have some of the most difficult travel schedules and jet lag plays a real impact is professional tennis, the NBA (Basketball) and the MLB (Baseball). Professional tennis players travel more than 100,000 miles per year and have some of the longest flights across the globe. The NBA and MLB also have a grueling travel schedule requiring over 50,000 miles per year and a lot of short trips with multiple circadian rhythm disruptions per week.
In this article, we’ll break down:
In this article, we’ll break down:
- What jet lag really is! From a circadian biology perspective
- Why it matters for performance, recovery, and long-term health
- The latest science on interventions that work (and those that don’t)
- Practical protocols you can apply before, during, and after travel
- How I use this information to help top performers adapt faster and perform better
What Is Jet Lag? The Circadian Desynchrony Dilemma
Jet lag is not just “feeling tired.” It’s a physiological mismatch between your internal circadian clock and the external time at your destination. Your body operates on a roughly 24-hour rhythm governed by the suprachiasmatic nucleus (SCN), which is a small region in the hypothalamus that synchronizes functions like sleep-wake cycles, hormone secretion, metabolism, and core body temperature. It is made up of 10,000 neurons and has a major impact on jet lag. I describe this as our bodies circadian clock.
When you rapidly cross multiple time zones, your internal circadian rhythm becomes misaligned with local time. This leads to:
Research shows the circadian system adapts better travelling east vs travelling west (Arendt, 2009). Some data has shown that if you do not put together a structured plan, crossing 6 time zones could impact your performance, health and enjoyment for 6-7 days (Arendt, 2009). Although some of the data shows that for each timezone crosses you may need 1 day for adjustment. So for a 6 hour time change you may need 6 days to fully adjust. This is assuming that you do not apply any of the strategies that we utilize to help individuals adjust.
Jet lag is not just “feeling tired.” It’s a physiological mismatch between your internal circadian clock and the external time at your destination. Your body operates on a roughly 24-hour rhythm governed by the suprachiasmatic nucleus (SCN), which is a small region in the hypothalamus that synchronizes functions like sleep-wake cycles, hormone secretion, metabolism, and core body temperature. It is made up of 10,000 neurons and has a major impact on jet lag. I describe this as our bodies circadian clock.
When you rapidly cross multiple time zones, your internal circadian rhythm becomes misaligned with local time. This leads to:
- Sleep disturbances
- Daytime fatigue
- Cognitive slowing
- Mood disruptions
- Gastrointestinal discomfort
- Impaired physical performance
Research shows the circadian system adapts better travelling east vs travelling west (Arendt, 2009). Some data has shown that if you do not put together a structured plan, crossing 6 time zones could impact your performance, health and enjoyment for 6-7 days (Arendt, 2009). Although some of the data shows that for each timezone crosses you may need 1 day for adjustment. So for a 6 hour time change you may need 6 days to fully adjust. This is assuming that you do not apply any of the strategies that we utilize to help individuals adjust.
Why Jet Lag Matters for Durability and Healthspan
Chronic disruption of circadian rhythms has been linked to:
Our goal with the work we do with elite individuals and companies is to build resilient, high-functioning humans across all time zones and a significant aspect of our work is helping these high achievers manage jet lag with the latest science in a practical way.
Chronic disruption of circadian rhythms has been linked to:
- Decreased athletic performance
- Altered cortisol and testosterone levels
- Increased inflammation and oxidative stress
- Impaired glucose metabolism and insulin sensitivity
- Higher risks of cardiometabolic disease, cancer, and mood disorders
Our goal with the work we do with elite individuals and companies is to build resilient, high-functioning humans across all time zones and a significant aspect of our work is helping these high achievers manage jet lag with the latest science in a practical way.
What the Latest Science Says: Interventions That Work
1. Light Exposure Timing
Light is the primary zeitgeber - an environmental cue that resets the circadian clock. Strategic exposure to natural or appropriate artificial light can shift your internal clock in the desired direction.
Exposure to bright light in the morning helps advance the clock (ideal for eastward travel), while evening light delays it (ideal for westward travel).
💡 Application:
Here is one cost-effective and small 10,000 lux (sun mimicking) lamp that works great for travel or home use - https://verilux.com/collections/happylight-therapy-lamps/products/happylight-mini
2. Melatonin Supplementation
Melatonin is the body’s “sleep hormone,” secreted by the pineal gland in response to darkness. Exogenous melatonin can shift circadian rhythms, especially when taken 4–6 hours before endogenous secretion begins.
A systematic review in the reputable Coachrane Database confirms that low-dose melatonin (~0.5–3 mg) taken at local bedtime at the destination can accelerate adaptation and improve sleep onset (Herxheimer et al 2002).
💊 Potential Application:
3. Timed Exercise
Exercise itself is a circadian cue. Moderate-intensity aerobic exercise in the morning advances the clock (east travel), while evening exercise delays it (west travel). Exercise timing significantly influenced how fast elite athletes adapted to transmeridian travel. This supports its role as a non-pharmacological intervention to shift rhythms (Thomas et al. 2020).
🏃 Application:
1. Light Exposure Timing
Light is the primary zeitgeber - an environmental cue that resets the circadian clock. Strategic exposure to natural or appropriate artificial light can shift your internal clock in the desired direction.
Exposure to bright light in the morning helps advance the clock (ideal for eastward travel), while evening light delays it (ideal for westward travel).
💡 Application:
- Eastward travel: Get 30–60 minutes of outdoor light early in the local morning. Avoid bright light in the evening.
- Westward travel: Delay morning light exposure. Maximize afternoon/evening light.
Here is one cost-effective and small 10,000 lux (sun mimicking) lamp that works great for travel or home use - https://verilux.com/collections/happylight-therapy-lamps/products/happylight-mini
2. Melatonin Supplementation
Melatonin is the body’s “sleep hormone,” secreted by the pineal gland in response to darkness. Exogenous melatonin can shift circadian rhythms, especially when taken 4–6 hours before endogenous secretion begins.
A systematic review in the reputable Coachrane Database confirms that low-dose melatonin (~0.5–3 mg) taken at local bedtime at the destination can accelerate adaptation and improve sleep onset (Herxheimer et al 2002).
💊 Potential Application:
- Use 0.5–3 mg melatonin 1–2 hours before local bedtime for several days after arrival. Some athletes and high performers respond to higher doses of 4-8mg. However, higher doses should be under to care of a healthcare professional.
- Avoid higher doses unless specifically advised, as they can cause grogginess.
- Combine with dim lighting and blue-light blocking before bed.
- Caution: Some individuals do have mild side effects such as hypnotic effects, confusion, and headaches.
3. Timed Exercise
Exercise itself is a circadian cue. Moderate-intensity aerobic exercise in the morning advances the clock (east travel), while evening exercise delays it (west travel). Exercise timing significantly influenced how fast elite athletes adapted to transmeridian travel. This supports its role as a non-pharmacological intervention to shift rhythms (Thomas et al. 2020).
🏃 Application:
- East travel: 20–40 minutes of low-to-moderate intensity aerobic exercise (brisk walk, jog, cycle) in the morning.
- West travel: Same protocol in the early evening.
- Avoid high-intensity, high power type activity the first 48 hours post-arrival unless fully recovered (risk vs reward).
4. Sleep Banking and Strategic Napping
Travel-induced sleep debt is cumulative. Preemptively increasing total sleep time—called sleep banking—can blunt jet lag effects. Strategic naps (15–30 min) can also restore alertness.Also, pre-travel sleep extension improves alertness and performance post-travel, especially in athletes (Van Rensburg et al 2020).
😴 Application:
Caffeine is a double-edged sword. It can be very useful when timed correctly but disruptive if overused at the wrong time. Research shows it can improve alertness during circadian low points, but timing is critical.
In an in-depth review article by Halson et al (2019) caffeine taken at local morning (after red-eye flights) improved cognitive alertness and mood.
☕ Application:
Travel-induced sleep debt is cumulative. Preemptively increasing total sleep time—called sleep banking—can blunt jet lag effects. Strategic naps (15–30 min) can also restore alertness.Also, pre-travel sleep extension improves alertness and performance post-travel, especially in athletes (Van Rensburg et al 2020).
😴 Application:
- Sleep 8–9 hours/night for 2–3 nights before departure.
- Upon arrival, avoid a nap on Day 1 and limit naps to less than 30 minutes on Day 2-4. Ensure the nap is before 3pm (local time).
Caffeine is a double-edged sword. It can be very useful when timed correctly but disruptive if overused at the wrong time. Research shows it can improve alertness during circadian low points, but timing is critical.
In an in-depth review article by Halson et al (2019) caffeine taken at local morning (after red-eye flights) improved cognitive alertness and mood.
☕ Application:
- Use caffeine only after waking, not before or during red-eye flights.
- Dosing can be quit diverse based on genetics, tolerance, medical conditions etc. I have personally worked with individuals and have had varied dosages from 100mg to 500mg. It all depends on the individual circumstance - personalization is the key.
- Avoid caffeine after 2:00 PM local time to protect evening sleep.
6. Meal Timing and Nutrition
Your liver, gut, and pancreas all operate on circadian rhythms. Eating at inconsistent or inappropriate times can confuse peripheral clocks and exacerbate jet lag.
Fasting during travel and resuming meals at destination time may help resynchronize clocks, according to animal models and limited human trials.
🍽️ Application:
Your liver, gut, and pancreas all operate on circadian rhythms. Eating at inconsistent or inappropriate times can confuse peripheral clocks and exacerbate jet lag.
Fasting during travel and resuming meals at destination time may help resynchronize clocks, according to animal models and limited human trials.
🍽️ Application:
- Begin eating in sync with the destination's time zone upon arrival.
- Avoid large meals close to bedtime.
- Include protein-rich foods in the morning and limit sugar doe to insulin sensitivity and spikes in blood sugar.
- Hydrate well but avoid alcohol during travel—it worsens desynchrony.
- Caution: Limit sodium during the flight. Many airline meals are high sodium by nature.
Technology and Innovation:
A number of technologies are available to help with the flight to improve sleep (if it is an overnight flight) and to also improve blood flow to limit stiffness in joints and muscles as well.
Sleep Aid Technologies
It is an exciting time with the advancements in wearable technologies that can impact Jet Lag and specifically improving air travel and sleep. A few different options exist due to rapid development of quality products. One product that I use with many high performers is a neurotech headband that is clinically shown to help people fall asleep significantly faster, and restart sleep fast if they wake up (Bressler et al 2024). This is non-invasive and easy to wear on the flight itself and also as a regular sleep aid to help individuals fall asleep faster in the new time zone (but is also great for regular sleep issues at home as well). I liked the product so much I became and advisor to them to help athletes and high performers in all industries get to sleep easier and get back to sleep faster if they awake during the night. Take a look here at Elemind -
A number of technologies are available to help with the flight to improve sleep (if it is an overnight flight) and to also improve blood flow to limit stiffness in joints and muscles as well.
Sleep Aid Technologies
It is an exciting time with the advancements in wearable technologies that can impact Jet Lag and specifically improving air travel and sleep. A few different options exist due to rapid development of quality products. One product that I use with many high performers is a neurotech headband that is clinically shown to help people fall asleep significantly faster, and restart sleep fast if they wake up (Bressler et al 2024). This is non-invasive and easy to wear on the flight itself and also as a regular sleep aid to help individuals fall asleep faster in the new time zone (but is also great for regular sleep issues at home as well). I liked the product so much I became and advisor to them to help athletes and high performers in all industries get to sleep easier and get back to sleep faster if they awake during the night. Take a look here at Elemind -
East vs. West Travel: What’s Harder to Adapt To?
Eastward travel shortens the circadian day (you have to go to bed earlier), which is biologically harder than westward travel (lengthening the day). This explains why a 9-hour shift to Europe can feel worse than a similar trip to Asia.
🧭 Key Takeaway:
Protocols I Use With Athletes and Executives
Based on two decades of experience with Olympic athletes, ATP/WTA players, NBA teams, MLB players and high-performing CEOs, here’s a practical framework I apply when helping individuals prepare for time zone shifts. Just remember that everyone is different and I spend a lot of time personalizing the recommendations for each individual based on genetics, blood work, travel schedule, environmental changes and individual preferences as well.
✈️ Pre-Flight (2–3 Days Before Travel):
🛬 In-Flight:
🌞 Post-Arrival (First 3 Days):
Eastward travel shortens the circadian day (you have to go to bed earlier), which is biologically harder than westward travel (lengthening the day). This explains why a 9-hour shift to Europe can feel worse than a similar trip to Asia.
🧭 Key Takeaway:
- Prioritize light exposure and possible melatonin more aggressively for eastward travel.
- For westward travel, manage sleep extension, evening activity, and delayed meals.
Protocols I Use With Athletes and Executives
Based on two decades of experience with Olympic athletes, ATP/WTA players, NBA teams, MLB players and high-performing CEOs, here’s a practical framework I apply when helping individuals prepare for time zone shifts. Just remember that everyone is different and I spend a lot of time personalizing the recommendations for each individual based on genetics, blood work, travel schedule, environmental changes and individual preferences as well.
✈️ Pre-Flight (2–3 Days Before Travel):
- Adjust bedtime 30–60 min/day toward destination time
- Begin melatonin or light therapy if crossing >6 time zones
- Increase total sleep (sleep banking). Add 30-60 minutes per day for 2-4 days before travel.
- Hydrate well and reduce alcohol
🛬 In-Flight:
- Set your watch to destination time upon boarding
- Avoid heavy meals and limit sodium; stay lightly active if possible
- Use blue-light-blocking glasses if flying overnight
- Consider fasting or time meals with arrival time
- Utilize blood flow enhancing technologies on the flight (heat, electrical stimulation etc) to reduce stiffness in joints and muscles.
🌞 Post-Arrival (First 3 Days):
- Morning light exposure if flying east; evening light if flying west
- Melatonin 1 hour before local bedtime (if recommended by your healthcare provider)
- Moderate and appropriate exercise at strategic times
- Avoid caffeine after mid-afternoon and
- Avoid napping during the day on arrival day and adjust as soon as possible to local time.
- On day 2 onwards keep naps short
- Eat meals based on local time, even if not hungry
- Look into the "caffeine nap protocol" that I utilize with many high performers - Read the article here
Technology and Tools That Help
Here are evidence-supported tools I often recommend:
Here are evidence-supported tools I often recommend:
- Sleep Hardware – I am an advisor to Elemind and it is a great product
- Electrical Muscle Stimulators for blood flow (MarcPro & Firefly)
- Marc Pro – I have worked with Marco Pro for more than a decade and here is a discount code - https://mark-kovacs.com/marc-pro.html
- Firefly - a great product and have been utilizing these products for nearly a decade - Click The Link Here
- Re-Timer Glasses: Wearable light therapy for phase shifting
- Oura Ring / WHOOP / Garmin: Track sleep stages, HRV, readiness
- Blue-light blockers: Useful in-flight and before bedtime. Glasses to watch movies on the plane and also when watching tablets or your phone.
- Portable white noise machines: Aid sleep in new environments. These can be apps on your phone or portable (travel size machines). Many varieties exist.
Final Thoughts: Travel Durability Is About Rhythm
At its core, durability - the ability to perform at a high level for a long time - is intimately tied to rhythm. When we disrupt our internal rhythm through travel, we temporarily lose a degree of control over performance, health, and cognitive clarity. But we can reclaim it with the right strategies.
The most durable people I’ve coached (on the court and in the boardroom) don’t just adapt quickly. They plan ahead. They prioritize recovery. And they understand that every cell in the body keeps time - we just need to give it the right cues.
So the next time you travel, don’t wing it. Build a protocol, adjust your environment, and manage your body clock for sustained performance.
References
At its core, durability - the ability to perform at a high level for a long time - is intimately tied to rhythm. When we disrupt our internal rhythm through travel, we temporarily lose a degree of control over performance, health, and cognitive clarity. But we can reclaim it with the right strategies.
The most durable people I’ve coached (on the court and in the boardroom) don’t just adapt quickly. They plan ahead. They prioritize recovery. And they understand that every cell in the body keeps time - we just need to give it the right cues.
So the next time you travel, don’t wing it. Build a protocol, adjust your environment, and manage your body clock for sustained performance.
References
- Bressler, S., Neely, R., Yost, R.M. et al. A randomized controlled trial of alpha phase-locked auditory stimulation to treat symptoms of sleep onset insomnia. Sci Rep 14, 13039 (2024). https://doi.org/10.1038/s41598-024-63385-1
- Halson, S. L., Burke, L. M., & Pearce, J. (2019). Nutrition for Travel: From Jet lag To Catering. International Journal of Sport Nutrition and Exercise Metabolism, 29(2), 228-235. https://doi.org/10.1123/ijsnem.2018-0278
- Herxheimer A, Petrie KJ. Melatonin for the prevention and treatment of jet lag. Cochrane Database Syst Rev. 2002;(2):CD001520. doi: 10.1002/14651858.CD001520. PMID: 12076414.
- Van Rensburg, D. C. C. J., Van Rensburg, A. J., Fowler, P., Fullagar, H., Stevens, D., Halson, S., ... & Cronje, T. (2020). How to manage travel fatigue and jet lag in athletes? A systematic review of interventions. British journal of sports medicine, 54(16), 960-968. https://bjsm.bmj.com/content/54/16/960
- Van Rensburg, D. C., Jansen van Rensburg, A., Fowler, P. M., Bender, A. M., Stevens, D., Sullivan, K. O., ... & Botha, T. (2021). Managing travel fatigue and jet lag in athletes: a review and consensus statement. Sports Medicine, 51(10), 2029-2050. https://link.springer.com/article/10.1007/s40279-021-01502-0
- Thomas JM, Kern PA, Bush HM, McQuerry KJ, Black WS, Clasey JL, Pendergast JS. Circadian rhythm phase shifts caused by timed exercise vary with chronotype. JCI Insight. 2020 Feb 13;5(3):e134270. doi: 10.1172/jci.insight.134270. PMID: 31895695; PMCID: PMC7098792.
- Tsukahara, Y., Kamada, H., Torii, S., & Yamasawa, F. (2024). Improvement of Jet Lag and Travel Fatigue Symptoms and Their Association with Prior International Travel Experience in Junior Athletes. Sports, 12(8), 220. https://doi.org/10.3390/sports12080220
If you have interest in learning more about the Durability program and working directly with Dr. Kovacs please see more information HERE
- Published on
By Dr. Mark Kovacs, PhD, FACSM, CSCS
Human Performance Strategist | Sport Scientist | Longevity Expert
Human Performance Strategist | Sport Scientist | Longevity Expert
Introduction
Across centuries and continents, sauna bathing has served as a ritual of cleansing, recovery, and rejuvenation. From the Finnish sauna (traditional sauna) to modern infrared cabins, the act of purposeful heat exposure is more than just a tradition — it's a science-backed practice with profound effects on human health, athletic recovery, and longevity. Having used sauna’s as an athlete first and then for the last two decades advising national sports federations, pro sports team and the top wellness and longevity centers, this article is a summary guide about what the differences are in the major sauna options and also what to look forward if you are considering purchasing a product. The field has become complicated and many large companies who should have expert advisors working with them are still making major mistakes in the types of saunas they are purchasing and not providing accurate or appropriate protocols for their members, guests and athletes. The hope is that this will help individuals and corporations make better decisions and provide the consumer (user) with a better experience and help them in their health and performance journey.
In this guide, we will explore:
Across centuries and continents, sauna bathing has served as a ritual of cleansing, recovery, and rejuvenation. From the Finnish sauna (traditional sauna) to modern infrared cabins, the act of purposeful heat exposure is more than just a tradition — it's a science-backed practice with profound effects on human health, athletic recovery, and longevity. Having used sauna’s as an athlete first and then for the last two decades advising national sports federations, pro sports team and the top wellness and longevity centers, this article is a summary guide about what the differences are in the major sauna options and also what to look forward if you are considering purchasing a product. The field has become complicated and many large companies who should have expert advisors working with them are still making major mistakes in the types of saunas they are purchasing and not providing accurate or appropriate protocols for their members, guests and athletes. The hope is that this will help individuals and corporations make better decisions and provide the consumer (user) with a better experience and help them in their health and performance journey.
In this guide, we will explore:
- The types of saunas and how they work
- Optimal temperatures and durations
- Physiological and molecular mechanisms of benefit
- Synergistic strategies such as contrast therapy
- Specific protocols for health, performance, and lifespan extension
Types of Saunas
1. Traditional Finnish Sauna (Dry Sauna)
This high-temperature, low-humidity sauna is typically heated with a wood or electric stove. Temperatures range between 70°C to 100°C (158°F to 212°F), with humidity around 10–20%. Water is occasionally poured on rocks to increase perceived heat without drastically raising humidity.
Benefits: Elevates core body temperature rapidly, stimulates cardiovascular adaptation, increases sweat rate.
2. Steam Sauna (Wet Sauna)
Also known as a steam room or Turkish bath, this uses moist heat. Temperatures are lower, around 40°C to 50°C (104°F to 122°F), but humidity reaches 100%.
Benefits: Effective for skin hydration, respiratory benefits, and relaxation; less cardiovascular stress due to lower temperature.
3. Infrared Sauna
This modern sauna type uses infrared radiation (IR) to directly heat the body without significantly warming the surrounding air. Typical temps range from 45°C to 65°C (113°F to 149°F).
Benefits: Deeper tissue penetration with lower environmental heat load. Often preferred for joint pain, muscle recovery, and individuals sensitive to high heat.
Understanding Infrared Radiation in Saunas: Wavelengths and What to Look For
Infrared saunas differ from traditional saunas by using infrared light to directly heat the body rather than the surrounding air. This results in lower ambient temperatures while still achieving deep tissue heat penetration. This combination makes it more tolerable for longer sessions, especially for individuals sensitive to high heat.
1. Traditional Finnish Sauna (Dry Sauna)
This high-temperature, low-humidity sauna is typically heated with a wood or electric stove. Temperatures range between 70°C to 100°C (158°F to 212°F), with humidity around 10–20%. Water is occasionally poured on rocks to increase perceived heat without drastically raising humidity.
Benefits: Elevates core body temperature rapidly, stimulates cardiovascular adaptation, increases sweat rate.
2. Steam Sauna (Wet Sauna)
Also known as a steam room or Turkish bath, this uses moist heat. Temperatures are lower, around 40°C to 50°C (104°F to 122°F), but humidity reaches 100%.
Benefits: Effective for skin hydration, respiratory benefits, and relaxation; less cardiovascular stress due to lower temperature.
3. Infrared Sauna
This modern sauna type uses infrared radiation (IR) to directly heat the body without significantly warming the surrounding air. Typical temps range from 45°C to 65°C (113°F to 149°F).
Benefits: Deeper tissue penetration with lower environmental heat load. Often preferred for joint pain, muscle recovery, and individuals sensitive to high heat.
Understanding Infrared Radiation in Saunas: Wavelengths and What to Look For
Infrared saunas differ from traditional saunas by using infrared light to directly heat the body rather than the surrounding air. This results in lower ambient temperatures while still achieving deep tissue heat penetration. This combination makes it more tolerable for longer sessions, especially for individuals sensitive to high heat.
- Infrared Radiation Basics
Most commercial far-infrared saunas use ceramic or carbon heating panels that emit radiation in the 6–12 µm range — ideal for penetrating skin and raising core body temperature.
What to Look for When Choosing an Infrared Sauna
4. Far-Infrared and Near-Infrared
Some infrared saunas offer near-infrared (NIR) or far-infrared (FIR) light. FIR is more commonly used in wellness centers and has been shown to enhance detoxification and promote mild cardiovascular effects (Laukkanen et al., 2018).
Near-Infrared (NIR) vs. Far-Infrared (FIR): What’s the Difference — and Why It Matters
Modern infrared saunas often distinguish themselves by offering different infrared light spectra: near-infrared (NIR) and far-infrared (FIR). Each penetrates the body differently, activates distinct physiological responses, and may be more or less appropriate depending on your goals - whether it’s skin health, detoxification, cardiovascular conditioning, or mitochondrial stimulation.
Far-Infrared (FIR)
Documented Benefits:
Who Should Use FIR?
Near-Infrared (NIR)
Documented Benefits:
Often Delivered Via:
Who Should Use NIR?
Pro Tip: Many high-end saunas now offer full-spectrum technology, incorporating NIR, MIR, and FIR in a single session. If you're seeking broad-spectrum benefits, including deep tissue heating and mitochondrial activation, this is your best bet. Ideally you would like to be able to turn on and off the different options based on how best you may want to use it.
What to Look for When Buying
What to Look for When Choosing an Infrared Sauna
- Wavelength Range
- Look for full-spectrum infrared saunas if you want exposure to all three types (NIR, MIR, FIR).
- For cardiovascular, detox, and relaxation benefits, FIR (6–12 µm) is well-supported in research (Laukkanen et al., 2018).
- Heater Technology
- Carbon fiber panels offer broader surface heating and lower EMF.
- Ceramic heaters produce higher heat intensity but may have narrower coverage.
- Low EMF & ELF Ratings
- Choose models tested for low electromagnetic fields (EMF) and extremely low frequency (ELF) radiation for safety.
- Temperature Settings
- Ideal operating temperatures range between 45°C and 65°C (113°F–149°F).
- Sessions typically last 20–40 minutes, depending on tolerance and purpose.
- Certifications
- Ensure the sauna is ETL, CE, or ISO certified, and that wood materials are non-toxic and untreated.
- Near-Infrared Add-Ons
- Some units include near-infrared light therapy panels (or LEDs in the 800–850 nm range), which may support mitochondrial health and skin regeneration.
4. Far-Infrared and Near-Infrared
Some infrared saunas offer near-infrared (NIR) or far-infrared (FIR) light. FIR is more commonly used in wellness centers and has been shown to enhance detoxification and promote mild cardiovascular effects (Laukkanen et al., 2018).
Near-Infrared (NIR) vs. Far-Infrared (FIR): What’s the Difference — and Why It Matters
Modern infrared saunas often distinguish themselves by offering different infrared light spectra: near-infrared (NIR) and far-infrared (FIR). Each penetrates the body differently, activates distinct physiological responses, and may be more or less appropriate depending on your goals - whether it’s skin health, detoxification, cardiovascular conditioning, or mitochondrial stimulation.
Far-Infrared (FIR)
- Wavelength: 5.6 to 1000 microns (µm), most commonly 6–12 µm in wellness devices
- Penetration: 1–2 inches (2.5–5 cm) into soft tissue
- Mechanism: FIR waves resonate with water molecules in the body, generating heat through vibrational energy and increasing internal body temperature without significantly raising ambient air temperature.
Documented Benefits:
- Cardiovascular effects: Increases heart rate and blood flow similarly to moderate aerobic exercise (Laukkanen et al., 2018; Beever, 2010).
- Detoxification: Promotes sweating and mobilization of fat-stored toxins (Crinnion, 2011).
- Inflammation and pain reduction: Shown to reduce chronic pain and stiffness in rheumatoid arthritis and fibromyalgia (Masuda et al., 2005).
- Stress relief: Supports parasympathetic activation and may improve HRV (Kaura et al., 2021).
Who Should Use FIR?
- Individuals focused on detox, cardiovascular health, or chronic stress recovery
- Those with low heat tolerance (FIR saunas feel cooler)
- Older adults seeking gentle metabolic stimulation
Near-Infrared (NIR)
- Wavelength: 0.7 to 1.4 µm (often focused in the 800–850 nm range for therapeutic use)
- Penetration: Primarily affects the epidermis and upper dermis (few millimeters)
- Mechanism: NIR light interacts directly with mitochondria, especially cytochrome c oxidase, to stimulate ATP production, cellular repair, and growth factor release.
Documented Benefits:
- Skin rejuvenation and collagen production
- Wound healing acceleration
- Mitochondrial biogenesis
- Immune modulation and anti-inflammatory effects at the cellular level (Hamblin, 2017)
Often Delivered Via:
- LED panels or laser diodes (not heating elements)
- Integrated into saunas labeled as “full-spectrum” infrared
Who Should Use NIR?
- Individuals interested in skin health, photobiomodulation, or athletic recovery
- Biohackers targeting cellular rejuvenation and energy optimization
- People recovering from injury or surgery
Pro Tip: Many high-end saunas now offer full-spectrum technology, incorporating NIR, MIR, and FIR in a single session. If you're seeking broad-spectrum benefits, including deep tissue heating and mitochondrial activation, this is your best bet. Ideally you would like to be able to turn on and off the different options based on how best you may want to use it.
What to Look for When Buying
- FIR Only: Most infrared saunas fall into this category. Look for a FIR range of 6–12 µm, low EMF, and carbon or ceramic panels.
- Full-Spectrum: Look for explicitly labeled NIR and FIR emitters, especially if photobiomodulation or skin therapy is part of your goal.
- Wavelength Clarity: Reliable manufacturers list specific wavelength bands (e.g., “850 nm NIR LED” or “6–12 µm FIR panel”).
- Independent Testing: Ensure the unit is certified for EMF, electrical safety, and wood toxicity (ETL, CE, RoHS).
Why Most People Do Not Use the Infrared Sauna’s Correctly. The Distance Matters!
How Close Should You Be to Infrared Light?
✅ For Near-Infrared (NIR) Light Therapy
✅ For Far-Infrared (FIR) Heat Therapy
How Close Should You Be to Infrared Light?
✅ For Near-Infrared (NIR) Light Therapy
- Ideal Distance: 6 to 24 inches (15 to 60 cm) from the light source
- Why: At this range, irradiance (light intensity) is strong enough to stimulate mitochondrial cytochrome c oxidase without overheating the skin.
- Session Duration:
- 6–12 inches away → ~5–10 minutes per area
- 18–24 inches away → ~10–20 minutes per area
✅ For Far-Infrared (FIR) Heat Therapy
- Ideal Distance: FIR panels are typically integrated into walls, and you're seated or reclined ~6–12 inches (15–30 cm) from the source.
- FIR is non-visible heat radiation; you don’t need to be as close for it to penetrate 1–2 inches (2.5–5 cm) into muscle and tissue.
💡 Pro Tips
- Target Specific Areas: For joint pain, injury recovery, or post-exercise treatment, aim NIR light directly on the affected area for localized benefits.
- Avoid Clothing: Direct skin exposure is critical — clothing blocks NIR and FIR.
- Limit Eye Exposure: Use protective eyewear for NIR sessions <12 inches away. While FIR poses minimal eye risk, NIR LEDs are powerful.
Physiological Mechanisms: Why Saunas Work
Sauna exposure creates a mild thermal stress, triggering a range of protective and adaptive responses, including:
Sauna exposure creates a mild thermal stress, triggering a range of protective and adaptive responses, including:
- Cardiovascular conditioning: Mimics moderate aerobic exercise by raising heart rate and plasma volume (Hussain & Cohen, 2018).
- Heat shock protein (HSP) activation: HSPs repair damaged proteins and enhance cellular resilience (Gryka et al., 2020).
- Improved endothelial function: Via nitric oxide synthesis and vasodilation (Kihara et al., 2002).
- Hormesis: Repeated, low-dose stress exposure enhances the body’s resilience to future stress (Seitz et al., 2021).
- Metabolic benefits: Increases insulin sensitivity and reduces inflammation markers such as CRP (C-reactive protein) (Laukkanen et al., 2015).
Important: Always hydrate before and after. Beginners should start conservatively and build tolerance.
Scientific Evidence: Health, Performance, Longevity
1. Cardiovascular & Mortality Outcomes
A landmark 20-year Finnish study involving over 2,000 men found that frequent sauna use (4–7x/week) was associated with a 50% lower risk of cardiovascular disease and all-cause mortality compared to once-weekly users (Laukkanen et al., 2015).
2. Brain Health and Neuroprotection
Heat exposure may reduce the risk of dementia and Alzheimer's disease via improved vascular function and reduced oxidative stress (Laukkanen et al., 2017).
3. Performance Recovery
Saunas reduce muscle soreness, enhance muscle repair via HSP (Heat Shock Proteins) activation, and improve parasympathetic nervous system balance post-exercise (Scoon et al., 2007).
4. Hormonal and Stress Modulation
Short-term heat stress increases growth hormone (GH) and modulates cortisol. These responses aid in recovery and tissue regeneration (Kaikkonen et al., 2024).
Contrast Therapy: Sauna + Cold
Combining sauna with cold immersion or showers — known as contrast therapy — creates vascular pumping effects, enhances muscle recovery, and improves mood through dopamine and norepinephrine release.
Durability Recommended Contrast Protocol
Scientific Evidence: Health, Performance, Longevity
1. Cardiovascular & Mortality Outcomes
A landmark 20-year Finnish study involving over 2,000 men found that frequent sauna use (4–7x/week) was associated with a 50% lower risk of cardiovascular disease and all-cause mortality compared to once-weekly users (Laukkanen et al., 2015).
2. Brain Health and Neuroprotection
Heat exposure may reduce the risk of dementia and Alzheimer's disease via improved vascular function and reduced oxidative stress (Laukkanen et al., 2017).
3. Performance Recovery
Saunas reduce muscle soreness, enhance muscle repair via HSP (Heat Shock Proteins) activation, and improve parasympathetic nervous system balance post-exercise (Scoon et al., 2007).
4. Hormonal and Stress Modulation
Short-term heat stress increases growth hormone (GH) and modulates cortisol. These responses aid in recovery and tissue regeneration (Kaikkonen et al., 2024).
Contrast Therapy: Sauna + Cold
Combining sauna with cold immersion or showers — known as contrast therapy — creates vascular pumping effects, enhances muscle recovery, and improves mood through dopamine and norepinephrine release.
Durability Recommended Contrast Protocol
- 15 minutes in dry sauna (90°C / 194°F)
- 30–60 seconds in cold plunge or cold shower (10–15°C / 50–59°F)
- Repeat for 2–3 rounds
- End on cold for muscle recovery, or on warm for relaxation
Protocols by Goal
✅ Protocol A: General Health and Cardiovascular Longevity
🏋️♂️ Protocol B: Athletic Recovery
Evidence: Gryka et al. (2020); Kaikkonen et al. (2024)
🧬 Protocol C: Longevity and Stress Resilience
Evidence: Laukkanen et al. (2018); Seitz et al. (2021); Zaccardi et al. (2024)
✅ Protocol A: General Health and Cardiovascular Longevity
- Frequency: 3–5x per week
- Type: Traditional dry sauna or infrared
- Temp: 80–90°C / 176–194°F (dry) or 55–65°C / 131–149°F (infrared)
- Duration: 15–20 minutes
- Follow with hydration and light stretching
- Benefits: Reduced all-cause mortality, lower blood pressure, improved endothelial health
🏋️♂️ Protocol B: Athletic Recovery
- Frequency: Post-training 2–3x/week
- Type: Infrared or traditional dry sauna
- Temp: Infrared (55–60°C / 131–140°F); 80–90°C / 176–194°F (dry)
- Duration: 20–25 minutes, split into two 10–12 min bouts
- Optional: Add contrast therapy (1 min cold)
- Follow-up: Protein-rich meal or recovery shake
Evidence: Gryka et al. (2020); Kaikkonen et al. (2024)
🧬 Protocol C: Longevity and Stress Resilience
- Frequency: 4–6x/week
- Type: Alternate dry and infrared
- Temp: Infrared (55–60°C / 131–140°F); 80–90°C / 176–194°F (dry)
- Duration: 25–30 minutes, progressive over time
- Incorporate breathwork or mindfulness
- End with a cool rinse
Evidence: Laukkanen et al. (2018); Seitz et al. (2021); Zaccardi et al. (2024)
Safety Considerations
- Stay hydrated — dehydration risk increases with high sweat rates
- Avoid alcohol before sauna
- Individuals with cardiovascular conditions should consult a physician
- Pregnant individuals should avoid high heat exposure
- Start with lower temperatures and shorter durations
- Always check with your healthcare provider before starting a sauna protocol
Summary
Sauna use is one of the most accessible and scientifically validated lifestyle practices for improving cardiovascular function, metabolic health, neurological resilience, and overall longevity. Whether you’re an athlete seeking faster recovery or a longevity enthusiast pursuing healthier aging, sauna bathing offers a potent, low-risk tool — when used intentionally.
When combined with cold therapy, nutrient timing, and hydration strategies, the impact becomes even more profound. What was once a cultural ritual is now a foundational element of modern healthspan optimization.
References
Allan, A., & Mawhinney, C. (2023). Post-exercise cooling lowers skeletal muscle inflammation and damage: Evidence from recent physiological models. Journal of Physiology, 601(10), 2345–2361. https://doi.org/10.1113/JP284293
Gryka, D., Pilch, W., & Szarek, M. (2020). Thermoregulatory and cardiovascular responses to Finnish sauna bathing in healthy men. International Journal of Environmental Research and Public Health, 17(12), 4391. https://doi.org/10.3390/ijerph17124391
Hussain, J. N., & Cohen, M. M. (2018). Clinical effects of regular dry sauna bathing: A systematic review. Evidence-Based Complementary and Alternative Medicine, 2018, 1857413. https://doi.org/10.1155/2018/1857413
Kaikkonen, P., et al. (2024). Acute hormonal responses to heat exposure in trained men: implications for athletic recovery. European Journal of Applied Physiology, 124, 575–588. https://doi.org/10.1007/s00421-024-05642-9
Kihara, T., et al. (2002). Repeated sauna treatment improves vascular endothelial and cardiac function in patients with chronic heart failure. Journal of the American College of Cardiology, 39(5), 754–759. https://doi.org/10.1016/S0735-1097(01)01713-1
Laukkanen, T., Kunutsor, S., Zaccardi, F., & Laukkanen, J. A. (2015). Sauna bathing is associated with reduced cardiovascular and all-cause mortality in middle-aged Finnish men. JAMA Internal Medicine, 175(4), 542–548. https://doi.org/10.1001/jamainternmed.2014.8187
Laukkanen, T., Laukkanen, J. A., & Kunutsor, S. (2018). Cardiovascular and other health benefits of sauna bathing: A review of the evidence. Mayo Clinic Proceedings, 93(8), 1111–1121. https://doi.org/10.1016/j.mayocp.2018.04.008
Seitz, J., Reimers, A. K., & Wichert, R. (2021). Sauna bathing as a health promotion practice: A review on the health effects of regular sauna bathing. Medical Research Archives, 9(6). https://esmed.org/MRA/mra/article/view/3965
Scoon, G. S., Hopkins, W. G., Mayhew, S., & Cotter, J. D. (2007). Effect of post-exercise sauna bathing on endurance performance. European Journal of Applied Physiology, 101(6), 659–667. https://doi.org/10.1007/s00421-007-0548-y
Zaccardi, F., Laukkanen, T., & Laukkanen, J. A. (2024). Long-term sauna use and mortality: Expanded follow-up from the Kuopio Ischaemic Heart Disease Risk Factor Study. Scandinavian Journal of Medicine & Science in Sports. https://dialnet.unirioja.es/servlet/articulo?codigo=9704407
Sauna use is one of the most accessible and scientifically validated lifestyle practices for improving cardiovascular function, metabolic health, neurological resilience, and overall longevity. Whether you’re an athlete seeking faster recovery or a longevity enthusiast pursuing healthier aging, sauna bathing offers a potent, low-risk tool — when used intentionally.
When combined with cold therapy, nutrient timing, and hydration strategies, the impact becomes even more profound. What was once a cultural ritual is now a foundational element of modern healthspan optimization.
References
Allan, A., & Mawhinney, C. (2023). Post-exercise cooling lowers skeletal muscle inflammation and damage: Evidence from recent physiological models. Journal of Physiology, 601(10), 2345–2361. https://doi.org/10.1113/JP284293
Gryka, D., Pilch, W., & Szarek, M. (2020). Thermoregulatory and cardiovascular responses to Finnish sauna bathing in healthy men. International Journal of Environmental Research and Public Health, 17(12), 4391. https://doi.org/10.3390/ijerph17124391
Hussain, J. N., & Cohen, M. M. (2018). Clinical effects of regular dry sauna bathing: A systematic review. Evidence-Based Complementary and Alternative Medicine, 2018, 1857413. https://doi.org/10.1155/2018/1857413
Kaikkonen, P., et al. (2024). Acute hormonal responses to heat exposure in trained men: implications for athletic recovery. European Journal of Applied Physiology, 124, 575–588. https://doi.org/10.1007/s00421-024-05642-9
Kihara, T., et al. (2002). Repeated sauna treatment improves vascular endothelial and cardiac function in patients with chronic heart failure. Journal of the American College of Cardiology, 39(5), 754–759. https://doi.org/10.1016/S0735-1097(01)01713-1
Laukkanen, T., Kunutsor, S., Zaccardi, F., & Laukkanen, J. A. (2015). Sauna bathing is associated with reduced cardiovascular and all-cause mortality in middle-aged Finnish men. JAMA Internal Medicine, 175(4), 542–548. https://doi.org/10.1001/jamainternmed.2014.8187
Laukkanen, T., Laukkanen, J. A., & Kunutsor, S. (2018). Cardiovascular and other health benefits of sauna bathing: A review of the evidence. Mayo Clinic Proceedings, 93(8), 1111–1121. https://doi.org/10.1016/j.mayocp.2018.04.008
Seitz, J., Reimers, A. K., & Wichert, R. (2021). Sauna bathing as a health promotion practice: A review on the health effects of regular sauna bathing. Medical Research Archives, 9(6). https://esmed.org/MRA/mra/article/view/3965
Scoon, G. S., Hopkins, W. G., Mayhew, S., & Cotter, J. D. (2007). Effect of post-exercise sauna bathing on endurance performance. European Journal of Applied Physiology, 101(6), 659–667. https://doi.org/10.1007/s00421-007-0548-y
Zaccardi, F., Laukkanen, T., & Laukkanen, J. A. (2024). Long-term sauna use and mortality: Expanded follow-up from the Kuopio Ischaemic Heart Disease Risk Factor Study. Scandinavian Journal of Medicine & Science in Sports. https://dialnet.unirioja.es/servlet/articulo?codigo=9704407