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Hydrogen gas may shield Divers' lungs from oxygen harm

NCT ID NCT07263399

Knowledge-focused Sponsor: Blekinge Institute of Technology Source: ClinicalTrials.gov ↗

What the study statuses mean

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Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 tests whether adding a small amount of hydrogen to the breathing gas can reduce lung damage caused by breathing high levels of oxygen under pressure. Thirty-two healthy military divers will breathe either hydrogen-enriched or normal oxygen gas during two separate sessions. The goal is to see if hydrogen lowers oxidative stress and protects lung function.

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 32 people

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

Expected to start

Jan 2026

An estimate. Start dates often move.

Expected to finish

Dec 2030

An estimate. End dates often move.

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

20 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: * Military divers actively serving, aged 20-64 years * Meeting the Swedish Armed Forces physical standards for diving Exclusion Criteria: * Ongoing infection or illness that may impact pulmonary function * Use of alcohol or smoking cigarettes within 48 hours * Diving with any breathing gas within 48 hours * Diving with oxygen-enriched gas (100% O₂) within 2 weeks * Use of medications that could affect oxidative stress, lung function, or neurological status * Medical history of serious diving-related injuries or long-term complications

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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.

Diving medicine Healthy subjects (HS) Hydrogen-oxygen gas Hyperbaric oxygen Hyperoxia Oxidative stress Oxygen toxicity

How to take part

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

  1. The places running it

    2 sites. 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

  • Blekinge Institute of Technology

    Karlskrona, Blekinge County, 37179, Sweden

  • Swedish Armed Forces Diving and Naval Medicine Centre (DNC)

    Karlskrona, Sweden

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