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Oxygen under pressure: scientists peek at blood flow in healthy volunteers

NCT ID NCT03980210

Knowledge-focused Sponsor: University Hospital, Lille Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 25, 2026 · Last updated Jun 27, 2026 · Updated 2 times

Summary

This study looked at how breathing pure oxygen under high pressure (hyperbaric oxygen therapy) affects the smallest blood vessels in healthy adults. Fifteen volunteers underwent different oxygen and pressure combinations while researchers measured blood flow using special cameras and sensors. The goal was simply to understand the body's response, not to treat any disease.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
hyperbaric oxygen therapy (procedure)

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

15 people

The number who actually took part.

Started

Jun 2019

Finished

Jul 2019

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

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

Ages

18 to 64 years

Sex

Anyone

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: * To provide a medical certificate of fitness to dive (\< 1 year) * Consent given for study participation * French health insurance affiliated Exclusion Criteria: * Temporary or definitive contra-indication to dive * Pregnancy or \< 18 years of age * Precedent dive \< 24 hours * Under a legal protection measure * Medical history of a disease known to alter microcirculation

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Conditions

The condition(s) this trial relates to.

Hyperoxia

As listed by the trial registrant

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

Hyperbaric oxygen therapy

Contacts and locations

Locations

  • Hôpital Roger Salengro, CHU

    Lille, France

More trials for these conditions

Other studies related to the condition(s) this trial covers.