Hyperbaric Chambers for Athlete Recovery: What Does the Research Actually Measure?

Athletes are always looking for ways to recover faster.

Sleep, nutrition, hydration, massage, cold exposure, compression, mobility work, and active recovery are all common parts of the conversation. In recent years, hyperbaric oxygen chambers have also attracted attention as a possible athlete recovery tool.

The idea sounds straightforward: increase the amount of oxygen available to the body and potentially support recovery after hard training.

But there is an important question that often gets overlooked:

When researchers say they are studying “recovery,” what are they actually measuring?

The answer is more complicated than simply asking whether an athlete feels better after using a hyperbaric chamber.

Studies have measured everything from blood lactate and creatine kinase to sprint speed, jump height, muscle soreness, strength, heart rate, perceived fatigue, and muscle damage markers.

And those measurements do not always tell the same story.

Here is what the research actually looks at — and why understanding the difference matters.

What Is Hyperbaric Oxygen Therapy?

Hyperbaric oxygen therapy, commonly called HBOT, involves breathing oxygen while inside a chamber pressurized above normal atmospheric pressure.

Increasing pressure allows more oxygen to dissolve into the blood plasma, which can increase the amount of oxygen available to body tissues.

Clinical hyperbaric oxygen therapy is already used for several established medical indications, including decompression sickness, carbon monoxide poisoning, certain non-healing wounds, compromised grafts and flaps, and some other medical conditions.

Athletic recovery is a different area of research.

Researchers are investigating whether exposure to hyperbaric oxygen may influence some of the physiological processes that take place after strenuous exercise.

That does not mean every measured physiological change automatically results in faster recovery or improved athletic performance.

That distinction is one of the most important things to understand when reading the research.

What Does “Athlete Recovery” Actually Mean?

Recovery can mean several different things depending on the study.

For one researcher, recovery might mean:

• lower blood lactate after exercise;

• reduced creatine kinase levels;

• less muscle soreness;

• restoration of strength;

• improved jump performance;

• faster sprint performance;

• lower perceived fatigue;

• improved muscle oxygenation;

• or simply being ready to perform another demanding workout.

These outcomes measure different parts of recovery.

A blood test, for example, may show that a particular marker has changed without showing whether the athlete can actually run faster, jump higher, lift more weight, or return to normal training sooner.

That is why good research needs to look beyond a single biomarker.

1. Blood Lactate

Blood lactate is one of the most commonly discussed measurements in sports recovery research.

During intense exercise, lactate concentrations can increase substantially.

Researchers may therefore measure lactate:

before exercise → immediately after exercise → after recovery

and compare athletes who receive hyperbaric oxygen exposure with athletes who recover under normal conditions.

A recent systematic review and meta-analysis of hyperbaric oxygen treatment in athletes reported a reduction in post-recovery blood lactate in the pooled studies it evaluated. However, the same review found much more limited evidence for improvements in short-term power output and force production.

That difference matters.

A lower lactate measurement is a physiological finding.

It does not automatically mean an athlete recovered faster in every meaningful sense.

Why lactate should not be viewed in isolation

Lactate is also not simply a “waste product” that must be eliminated before the body can recover.

Modern exercise physiology recognizes lactate as part of normal energy metabolism.

So while changes in blood lactate can help researchers understand metabolic recovery, they should ideally be interpreted alongside actual performance measurements.

2. Creatine Kinase and Other Muscle Damage Markers

Another common research approach is measuring substances in the blood associated with muscular stress or damage.

These may include:

• creatine kinase (CK);

• myoglobin;

• lactate dehydrogenase (LDH);

• aspartate aminotransferase (AST);

• and other biochemical markers.

Creatine kinase receives particular attention because levels often increase following strenuous or unfamiliar exercise.

Some studies have reported differences in these markers after repeated HBOT sessions.

For example, one randomized study involving athletes with exercise-related muscular injuries reported reductions in creatine phosphokinase and myoglobin following a multi-session HBOT protocol.

But biochemical markers still need context.

CK levels can vary considerably between individuals depending on training history, genetics, exercise type, muscle mass, and the timing of the blood test.

A lower CK value therefore does not automatically mean an athlete can safely return to competition sooner.

3. Muscle Soreness

Researchers also ask athletes how sore they feel.

This may seem less scientific than a blood test, but subjective measures can be extremely relevant in sport.

Delayed-onset muscle soreness, commonly called DOMS, often develops after unfamiliar or high-volume exercise, particularly eccentric exercise.

Researchers might use a pain scale or soreness questionnaire at several points after exercise.

For example:

Immediately after exercise → 24 hours → 48 hours → 72 hours

A 2025 systematic review and meta-analysis evaluated HBOT for exercise-induced muscle injury and soreness. The analysis found evidence suggesting improved recovery from exercise-induced muscle injury, but it did not find the same improvement for muscle soreness.

This is another good example of why the word “recovery” can be misleading.

A biological marker may improve while the athlete still feels sore.

Or an athlete may feel less tired even though measurable performance has not changed.

4. Strength Recovery

If a recovery treatment works, one of the most useful questions is:

Does the athlete regain normal strength faster?

Researchers can measure this using equipment such as an isokinetic dynamometer.

Measurements might include:

• peak torque;

• maximal voluntary contraction;

• isometric strength;

• muscular endurance;

• or force production.

An older randomized, placebo-controlled study examined people after exercise-induced muscle damage and measured peak torque, isometric torque, muscular endurance, MRI findings, and pain.

The researchers found little evidence that recovery was meaningfully faster in the hyperbaric oxygen group compared with the sham-treatment group.

Another study evaluating exercise-induced muscle injury found no significant differences between groups in isometric strength, creatine kinase, soreness, or MRI markers.

These studies illustrate something important:

Improving oxygen availability does not necessarily translate directly into faster restoration of muscle function.

5. Sprint Performance

For football players, sprinters, rugby players, hockey players, basketball players, and many other athletes, sprint ability is highly relevant.

Researchers may test:

• 5-meter sprint times;

• 10-meter sprint times;

• 20-meter sprint times;

• repeated sprint ability;

• or peak power during cycling sprints.

A randomized controlled trial involving elite youth football players examined recovery following a 90-minute match.

Researchers measured biochemical markers alongside several practical performance tests, including 5-, 10-, and 20-meter sprint performance.

A single one-hour HBOT session did not produce significant differences between groups in the biochemical or performance measurements evaluated.

That does not prove that every HBOT protocol will produce the same result.

But it demonstrates why actual sporting performance should be measured rather than assuming changes in physiology automatically improve performance.

6. Jump Performance

Jump testing is another practical way to monitor neuromuscular recovery.

Researchers frequently use:

• squat jumps;

• countermovement jumps;

• countermovement jumps with arm swing;

• or repeated jump tests.

A hard training session or match can temporarily reduce jump height because of fatigue.

Researchers can then measure whether jump performance returns to baseline faster with a particular recovery strategy.

In the elite youth football study mentioned above, researchers included squat jump and countermovement jump measurements, but they did not find significant performance differences between the HBOT and control groups following the single treatment session.

For coaches, measurements like these may be more useful than isolated laboratory values because they relate directly to physical performance.

7. Perceived Fatigue and Wellness

Not every useful recovery measurement comes from laboratory equipment.

Researchers may also ask athletes about:

• fatigue;

• sleep quality;

• stress;

• muscle soreness;

• mood;

• perceived recovery;

• or general wellness.

Some studies use standardized questionnaires.

The football study, for example, used the Hooper Index, which combines subjective measures related to athlete wellness.

Although the researchers did not observe significant differences in the major biochemical or physical performance outcomes, they reported a difference in the Hooper Index one hour after the intervention.

This creates an interesting situation.

An athlete might feel more recovered without immediately performing better on sprint or jump tests.

That subjective improvement may still matter, but it should not be confused with proof of improved physical performance.

8. Heart Rate and Cardiovascular Measurements

Exercise recovery research may also measure:

• resting heart rate;

• peak heart rate;

• heart-rate recovery;

• oxygen consumption;

• oxygen saturation;

• or heart-rate variability.

Researchers use these measurements to understand how quickly the cardiovascular and autonomic systems return toward baseline.

However, results involving hyperbaric oxygen remain inconsistent.

A systematic review examining HBOT before, during, and after exercise found no significant improvement in peak heart rate or several other common recovery measurements following pre-exercise exposure.

Heart-rate measurements can contribute useful information, but they still represent only one part of the overall recovery picture.

9. VO2 Max and Exercise Capacity

Another research question is whether hyperbaric oxygen exposure affects aerobic capacity.

Researchers may measure:

VO2 max, time to exhaustion, cycling performance, treadmill performance, or endurance capacity.

The research becomes particularly complicated here because the timing of oxygen exposure varies considerably.

Some studies evaluate HBOT:

• before exercise;

• immediately after exercise;

• during recovery between exercise sessions;

• alongside a training program;

• or even during exercise under hyperbaric conditions.

These protocols are not interchangeable.

A systematic review of 27 studies examining hyperbaric oxygen and athletic performance described the available findings as contradictory and noted considerable differences between exercise protocols and hyperbaric oxygen protocols. The authors concluded that better-designed trials were needed before routine athletic use could be recommended on performance grounds.

10. Muscle Oxygenation

One proposed reason athletes are interested in hyperbaric chambers is the possibility of increasing oxygen availability to tissues.

Some research therefore measures muscle oxygenation directly.

Researchers may use technologies such as near-infrared spectroscopy to study changes in tissue oxygen levels.

From a physiological perspective, these measurements are interesting.

But again:

higher oxygen availability is a mechanism, not necessarily a performance outcome.

Researchers still need to demonstrate whether those changes produce practical improvements such as faster strength restoration, better repeated sprint performance, or improved training capacity.

11. MRI and Muscle Tissue Changes

Some studies go even further by examining muscle tissue itself.

Magnetic resonance imaging or spectroscopy can be used to evaluate changes associated with muscle injury, swelling, inflammation, or tissue metabolism.

These measurements can provide detailed information that would be impossible to obtain from simple performance testing.

But they also highlight the difference between laboratory recovery and real-world athletic recovery.

An imaging measurement may change without the athlete experiencing a meaningful difference in training or competition.

What Do Systematic Reviews Say Overall?

The research is still developing.

A 2021 systematic review and meta-analysis examined HBOT before, during, and after exercise. Ten studies involving 166 participants were included in the qualitative analysis, while six studies involving 69 participants could be combined quantitatively.

The researchers found no statistically significant benefit from pre-exercise HBOT on subsequent performance and no clear benefit from post-exercise HBOT on recovery. They noted possible improvements when hyperbaric oxygen was used during exercise, but emphasized that more research was necessary.

Newer analyses have reported some potentially positive findings.

One recent meta-analysis found lower post-recovery blood lactate levels following HBOT, while another reported improvements in measures associated with exercise-induced muscle injury but not muscle soreness.

Taken together, the research does not produce one simple answer.

Different studies:

• use different chamber pressures;

• use different oxygen concentrations;

• provide different session lengths;

• use one session or repeated sessions;

• study different types of exercise;

• test different populations;

• and measure different definitions of recovery.

That makes direct comparisons difficult.

Why HBOT Research Can Produce Different Results

Two studies may both claim to investigate hyperbaric oxygen for athlete recovery while testing very different interventions.

Imagine one study uses:

2.5 ATA for 60 minutes, three sessions after exercise

while another uses:

a lower pressure for a different duration after a football match.

Those are different exposures.

The exercise protocol also matters.

Recovering from:

• a marathon;

• repeated sprints;

• heavy resistance training;

• eccentric muscle-damaging exercise;

• a football match;

• or a cycling time trial

involves different physiological demands.

This is one reason researchers remain cautious about making broad conclusions.

Biomarker Improvement Does Not Always Equal Performance Improvement

This may be the single most important takeaway.

Suppose a study finds that athletes using HBOT have lower blood lactate.

That tells us something interesting about their metabolic response.

But coaches ultimately want to know:

Can the athlete perform better tomorrow?

That requires measurements such as:

• strength;

• sprint speed;

• power;

• endurance;

• training capacity;

• jump performance;

• injury recovery time;

• or return-to-play outcomes.

Until research consistently connects biological changes with meaningful athletic outcomes, biomarker findings should be interpreted carefully.

What Should Athletes Look for When Reading HBOT Research?

Instead of focusing only on a study's conclusion, look at the actual research design.

Ask five questions.

Who participated?

Were they elite athletes, recreational athletes, healthy adults, injured athletes, or people who rarely exercised?

Results from one group may not apply directly to another.

What exercise did they perform?

A recovery strategy following eccentric strength training may not produce the same results after endurance exercise or competitive football.

What HBOT protocol was used?

Look at:

• chamber pressure;

• oxygen concentration;

• session duration;

• number of sessions;

• and timing relative to exercise.

What did researchers actually measure?

Was the outcome blood lactate?

Muscle soreness?

Creatine kinase?

Sprint speed?

Strength?

Return to training?

Those outcomes should not be treated as interchangeable.

Was there a proper control group?

Placebo-controlled and blinded studies are particularly valuable when subjective outcomes such as fatigue, pain, and wellness are being measured.

Hyperbaric Chambers Should Not Replace the Basics of Recovery

Even as researchers continue studying HBOT, the fundamentals of athletic recovery remain important.

Athletes still need adequate:

• sleep;

• calories;

• protein;

• carbohydrates;

• hydration;

• training periodization;

• rest;

• and injury management.

A recovery technology should generally be viewed as something that may complement those basics rather than replace them.

Safety Also Matters

Hyperbaric chambers are not simply oxygen-filled relaxation pods.

Clinical hyperbaric oxygen is a medical procedure involving elevated pressure and concentrated oxygen.

The FDA has specifically reminded healthcare providers and facilities that HBOT devices require appropriate operating procedures, staff training, fire-prevention measures, grounding, and compliance with manufacturer instructions because serious injuries and deaths have been reported in connection with improper use.

The Undersea and Hyperbaric Medical Society also emphasizes appropriate equipment standards, physician oversight, and established safety procedures for clinical hyperbaric treatment.

Athletes considering HBOT should therefore discuss its suitability with an appropriately qualified medical professional rather than treating chamber pressure or oxygen exposure as something to experiment with independently.

So, Do Hyperbaric Chambers Improve Athlete Recovery?

The most accurate answer today is:

It depends on what you mean by recovery.

Some research suggests that hyperbaric oxygen may influence certain physiological recovery markers, including blood lactate and some markers associated with exercise-induced muscle damage.

Other studies have found little or no improvement in measures such as:

• strength;

• sprint performance;

• jump performance;

• muscle soreness;

• or short-term athletic performance.

The evidence also varies considerably depending on the pressure used, treatment duration, number of sessions, exercise protocol, athlete population, and outcome being measured.

That makes broad statements such as “HBOT speeds athletic recovery” much less useful than asking:

Which part of recovery?

And:

How was it measured?

The Bottom Line

Research into hyperbaric chambers for athlete recovery is interesting, but the word recovery covers many different outcomes.

Scientists may measure:

blood lactate → muscle damage markers → soreness → strength → sprint speed → jump performance → oxygenation → fatigue → wellness → aerobic capacity

These measurements can move in different directions.

An athlete can show an improvement in one biological marker while showing no measurable improvement in strength or performance.

That is why the strongest studies do more than test blood values. They combine laboratory measurements with practical performance outcomes and meaningful follow-up periods.

As research continues, the key question should not simply be:

“Does hyperbaric oxygen change something after exercise?”

It should be:

“Does that change help athletes recover or perform in a way that actually matters?”

For athletes, coaches, clinicians, and anyone considering a hyperbaric chamber for recovery, that distinction is where the most useful conversation begins.

This article is intended for educational purposes and does not replace medical advice, diagnosis, or treatment. Hyperbaric oxygen therapy should be discussed with an appropriately qualified healthcare professional, particularly when it is being considered for a medical condition or injury.