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Can a short trip to sea level reset sleep and oxygen for high-altitude dwellers?

NCT ID NCT07801950

Knowledge-focused Sponsor: Silvia Ulrich Somaini 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Sep 03, 2026 · Last updated Sep 04, 2026 · Updated 1 time

Summary

This study looks at what happens when people who live above 2600 meters, in places like Quito, spend a week at sea level and then return to altitude. Researchers will measure sleep quality, oxygen levels during the night, and breathing patterns in healthy adults and in people with pulmonary arterial hypertension. The goal is to understand whether a temporary descent improves sleep and blood oxygen, and how the body readjusts on re-ascent.

What this could mean

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

Active substance
Descent from 2850m to sea level for 7 days, then re-ascent to 2850m
What this could lead to
If it works, this could clarify how brief time at lower altitude improves sleep and oxygen levels in high-altitude residents, and whether it helps people with pulmonary hypertension.
What could go wrong
The trial is small and observational, so results may not apply broadly. It does not test a treatment, and any benefits seen may fade after returning to altitude.

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 14 people

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

Expected to start

Sep 2026

An estimate. Start dates often move.

Expected to finish

Dec 2026

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

18 to 80 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: * Adults aged 18-80 years and of all genders * Permanent residence \> 2600 m * healthy: no self-perceived cardiopulmonary disease limiting daily activities * written informed consent to participate in the study Exclusion Criteria: * Age \<18 years or \>80 years * Participants who cannot follow the study investigations * Participants permanently living \< 2600m. * Participants who traveled and stayed overnight at altitudes \<2000 m in the past 4 weeks. * any self-perceived cardiopulmonary disease limiting daily activities

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Conditions

The condition(s) this trial relates to.

altitude sickness sleep apnea syndrome sleep disorder

As listed by the trial registrant

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

Healthy Healthy adult High altitude High altitude effects Polygraphy Sleep Sleep disordered breathing (SDB)

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

  • University Hospital of Zurich

    Zurich, 8091, Switzerland

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