Hyperbaric Oxygen Therapy (HBOT) is one of the more interesting recovery topics in current sports science. It appears in Premier League physio rooms, in Olympic recovery suites, and increasingly in wellbeing settings across the UK. The research is moving quickly, and the picture emerging from recent randomised trials is genuinely promising for anyone serious about how their body recovers.
This article walks through what the latest evidence actually says about mild HBOT and physical recovery: the findings, the mechanisms, and where the research is heading. Each finding is drawn from peer-reviewed research, cited by study, journal, and year, with the pressure protocol stated clearly so you can see the picture as it really is.
If you would like to start with your own baseline before exploring any therapy, our free HolistIQ assessment is the cleanest starting point.
What is mild HBOT, and why does recovery talk about it?
Hyperbaric Oxygen Therapy means breathing oxygen-enriched air inside a pressurised chamber. Under pressure, more oxygen dissolves into your bloodstream, reaching tissues that ordinary breathing cannot easily oxygenate. That additional oxygen is what supports faster recovery and tissue repair.
Mild HBOT (mHBOT) refers to gentler, lower-pressure protocols at around 1.3 to 1.5 ATA. These are the protocols most commonly used in UK wellbeing and recovery settings. Hospital-grade HBOT, used for conditions such as decompression illness or carbon monoxide poisoning, runs at higher pressures (2.0 to 2.8 ATA) and is clinician-led.
Why has recovery research kept coming back to oxygen? Because oxygen is the rate-limiter for almost every part of repair: muscle tissue rebuilding after a hard session, lactate clearance, inflammation resolution, mitochondrial function. If you can temporarily raise the oxygen available to tissues, the theory goes, you can support those processes more efficiently. Recent trials are starting to show how that plays out in practice.
What the research says about HBOT and physical recovery
Acute cardiovascular response: meaningful change after a single session
Some of the most interesting recent evidence is a 2025 randomised crossover trial published in the Journal of Physiological Anthropology. Fourteen healthy young men were measured after a single 60-minute session at 1.3 ATA, compared with a seated rest control. Resting heart rate dropped from 63.6 to 58.8 bpm (p=0.009), heart rate variability improved, and aerobic endurance and VO2peak trended in the right direction.
It is a small study in healthy people, but it is a randomised crossover at the exact pressure used in many UK wellbeing chambers. It shows that one session produces a real, measurable autonomic and cardiovascular response, which is an encouraging signal for anyone considering HBOT as a recovery adjunct.
Post-exercise recovery: lactate, soreness, perceived exertion
A 2021 systematic review and meta-analysis in Frontiers in Physiology pooled studies across 1.3 to 2.5 ATA and various exercise-timing protocols. Post-exercise HBOT was associated with reduced blood lactate, reduced perceived exertion, improved arterial oxygen saturation, and reduced muscle soreness. That is a consistent recovery profile across the literature.
A more recent 2025 systematic review of 17 RCTs in MDPI added an interesting nuance: while pain reduction and sleep improvements were consistent, delayed-onset muscle soreness (DOMS) results varied between studies. Some people respond strongly, others less so, which is a useful reminder that individual recovery patterns are part of the equation.
Aerobic capacity (VO2max): a notable performance signal
A double-blind, placebo-controlled RCT in Sports Medicine Open (2022) studied 37 middle-aged athletes through 60-minute sessions, 40 in total. The intervention significantly improved VO2max with an effect size near 1.0, which is clinically large for a non-pharmaceutical intervention.
The protocol used 2.0 ATA, which is above the mild-pressure range, so the headline VO2max finding sits at a higher pressure than the wellbeing-context protocols at 1.3 to 1.5 ATA. The mechanisms involved (angiogenesis, mitochondrial biogenesis) are biologically plausible at mild pressures, and ongoing research is exploring how the gains translate to gentler protocols. It is a good example of where the field is moving, and worth following.
Real-world elite use
At the 1998 Nagano Winter Olympics, seven elite athletes used mild HBOT (1.3 ATA, 30 to 40 minutes, up to six sessions). All seven reported faster recovery and quicker lactic-acid and ammonia clearance compared with untreated controls (Ishii et al., 2005). It is an observational case series with a small sample, but it remains the first documented elite-sport application of mild HBOT, and it gave momentum to the recovery research that has followed.
Strength recovery from soft-tissue injury
The MDPI 2025 systematic review reported athletes returning to pre-exercise strength after gastrocnemius strain in 3.2 ± 0.9 days, compared with 5.8 ± 1.1 days in controls. The protocol used 2.5 ATA, which is again above the mild-pressure range, so we share the result here as part of the wider HBOT picture rather than as a direct mild-pressure claim. Mechanistically the result is encouraging, and current research is examining how soft-tissue recovery responds at gentler pressures.
WADA status
HBOT is not on the WADA prohibited list. It is permitted both in and out of competition, and the IOC has not issued contraindications for its use in sport. That makes HBOT one of the few advanced recovery options athletes can explore without compliance concerns.
Where mild HBOT may help, and what it works best alongside
No therapy stands alone. HBOT has a clear role in supporting recovery, and it works best as part of a wider plan that already has the foundations in place. A useful at-a-glance view:
| HBOT may support | HBOT works best alongside |
|---|---|
| Faster recovery from heavy training load | Adequate sleep |
| Acute heart rate and heart rate variability response | Sound nutrition and hydration |
| Reduced post-exercise lactate and perceived exertion | A sensible training and rest plan |
| Reduction in muscle soreness (response varies) | Specialist clinical care where relevant |
| Adjunct to rehabilitation from soft-tissue injury | A sustainable training rhythm |
| Subjective recovery and return-to-training feel | Realistic, measurable goals |
Who might find HBOT most useful for recovery?
- Active adults managing high training loads who want a structured recovery adjunct
- Recreational and competitive athletes coming back from soft-tissue injury
- People in rehabilitation for muscle, tendon, or post-orthopaedic recovery
- Shift workers and chronically fatigued people looking for additional recovery support
A consistent pattern across the evidence: HBOT works best when sleep, nutrition, and stress physiology are already on track. With those foundations in place, the additional oxygen support gives your body more to work with.
Safety and screening: making sure HBOT is right for you
HBOT has a strong safety record at mild pressures, and a good screening conversation is part of how reputable providers help you get the most from it. A typical pre-session check covers:
- Ability to equalise ear and sinus pressure
- Lung health and respiratory history
- Any history of seizures (where relevant)
- Comfort with enclosed spaces
- Pregnancy, which calls for medical input
- How you are feeling on the day
This screening is part of how providers tailor sessions to your needs, and a provider who takes screening seriously is the kind worth working with.
How HBOT fits into the Rebalance approach
We see HBOT as a supportive adjunct that fits inside a wider wellbeing plan. The pathway is straightforward:
- Start with HolistIQ to get a baseline across sleep, energy, movement, stress, gut, recovery, and more.
- Book a Wellbeing Review to talk through what the assessment found and what you are aiming for.
- Layer in therapies, including HBOT, when they suit your goals and current foundations.
The result is a personalised plan rather than a one-size-fits-all package. If you would like to learn more about how HBOT works in this context, our Hyperbaric Oxygen Therapy page goes into more detail.
Frequently asked questions
Can a single HBOT session actually do anything?
Yes. A 2025 randomised crossover trial at 1.3 ATA showed measurable reductions in resting heart rate and improvements in heart rate variability after a single 60-minute session. Cumulative benefits build over a course, and many people report a noticeable difference in how they feel as sessions progress.
How many sessions before I notice anything?
Most recovery-focused protocols run 10 to 20 sessions, and the strongest performance trials use 40. A short series gives the body time to adapt, and many people start noticing changes in sleep, energy, or recovery within the first few sessions.
Is HBOT WADA-approved?
HBOT is not on the WADA prohibited list. It is permitted in and out of competition.
How does HBOT fit alongside good sleep, nutrition, and rest?
HBOT supports the recovery work your body is already doing. The evidence consistently shows the best outcomes when sleep, nutrition, and rest are already part of the picture, with HBOT adding extra oxygen support on top.
Is HBOT the same as what divers use?
Not quite. Decompression-illness HBOT runs at 2.0 to 2.8 ATA and is clinician-led. Mild HBOT (1.3 to 1.5 ATA) is what is used in wellbeing and recovery contexts. Different pressures, different protocols, different goals.
What pressure does Rebalance use?
We use mild HBOT, in line with the protocols studied in the recovery and rehabilitation literature. Full details are on our HBOT page.
Where to start
If you are curious about HBOT as part of your recovery picture, the easiest first step is information.
- Run the free HolistIQ assessment (around 40 minutes), which scores you across 8 wellbeing systems and surfaces the patterns most relevant to you.
- Book a Wellbeing Review for a structured conversation about your results and a personalised plan.
- Prefer to experience HBOT first hand? You can book a trial HBOT session directly.
- Explore our Hyperbaric Oxygen Therapy page to see how HBOT fits into a Rebalance pathway.
References
'A study on the effect of acute hyperbaric oxygen intervention on aerobic endurance', Journal of Physiological Anthropology (2025).
'Effects of pre-, post- and intra-exercise hyperbaric oxygen therapy on performance and recovery: a systematic review and meta-analysis', Frontiers in Physiology (2021).
'Effectiveness of hyperbaric oxygen therapy for musculoskeletal pain syndromes: a systematic review', Muscles (2025).
'Effects of hyperbaric oxygen therapy on mitochondrial respiration and physical performance in middle-aged athletes: a blinded, randomized controlled trial', Sports Medicine - Open (2022).
Ishii, Y. et al. (2005) 'Hyperbaric oxygen as an adjuvant for athletes', Sports Medicine, 35(9), pp. 739–746.
General information only. This content does not replace medical advice, diagnosis, or specialist clinical care. Mild HBOT is positioned as adjunctive, supporting your wider wellbeing plan rather than replacing medical care. For urgent symptoms, please use NHS urgent or emergency pathways.