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Oxygen vs. altitude: which boosts athletic performance more?

NCT ID NCT05447416

Knowledge-focused Sponsor: Assaf-Harofeh Medical Center Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study compares two techniques—intermittent hypoxic training (simulating high altitude) and hyperbaric oxygen therapy (breathing pure oxygen in a pressurized chamber)—to see which better improves aerobic performance in healthy athletes. About 66 active athletes aged 18-45 will participate. The goal is to measure changes in exercise capacity and endurance.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 66 people

The number the study aims to enrol. It can still change while the study runs.

Started

Jun 2023

Expected to finish

Dec 2027

An estimate. End dates often move.

Lead sponsor

A government agency

The lead sponsor is a government body.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 45 years

Sex

Male participants only

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Vo2max above 3500 ml or Vo2max/kg above 50 ml/kg 2. Age 18-45 3. Subjects are active aerobic athletes, training regularly more than 4 exercise sessions per week. 4. Subject willing and able to read, understand and sign an informed consent Exclusion Criteria: 1. Inability to attend scheduled clinic visits and/or comply with the study protocol 2. Active malignancy 3. Active smokers 4. Previous treatment of HBOT for any reason prior to study enrollment. 5. Chest pathology incompatible with pressure changes 6. Major orthopedic injury at the past 3 months 7. Inner ear disease 8. Lung pathology 9. The inability to perform an awake brain MRI 10. Claustrophobia 11. Previous neurologic conditions (e.g., Epilepsy, Brain tumors or s/p neurosurgery etc.) 12. Comorbidities and medications that rule out the subject

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As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Healthy active athletes

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • The Sagol Center for Hyperbaric Medicine and Research Shamir Medical Center (Assaf Harofeh)

    RECRUITING

    Zrifin, Israel

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