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Mountain air and menstrual cycles: new study on sleep breathing

NCT ID NCT06498544

Knowledge-focused Sponsor: University of Zurich 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
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 1 time

Summary

This study looked at how sleeping at high altitude (3600 m) affects breathing in healthy women, and whether the phase of their menstrual cycle makes a difference. 91 women spent two nights at altitude while their oxygen levels and breathing patterns were measured. The goal was to see if sleep-disordered breathing changes depending on where they are in their cycle.

What this could mean

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

What this could lead to
If successful, this could help understand why some women have more breathing problems during sleep at high altitudes, potentially guiding future travel or health advice.
What could go wrong
This is a small, completed observational study, not a treatment trial. Results may not apply to all women or to real-world conditions outside the lab.

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.

Participants

91 people

The number who actually took part.

Started

Jul 2024

Finished

Aug 2025

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.

Who is studied

Healthy, non-smoking, premenopausal women, age 18-44 years, without any disease and need of regular medication (including oral contraceptives).

Ages

18 to 44 years

Sex

Female 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.

Criteria: Inclusion Criteria: * Healthy, non-smoking women, age 18-44 years, without any diseases and need of regular medication (including oral contraceptives). * BMI \>18 kg/m2 and \<30 kg/m2 * Born, raised and currently living at altitudes \<1000 m * Written informed consent * Premenopausal, eumenorrheic cycle Exclusion Criteria: * Other types of contraceptives (hormonal intrauterine device, vaginal ring, subcutaneous injections or implants, among others) * Pregnancy or nursing * Anaemic (haemoglobin concentration \<10g/dl) * Any altitude trip \<4 weks before the study * Allergy to acetazolamide and other sulfonamides

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Conditions

The condition(s) this trial relates to.

Hypoxia sleep apnea syndrome

As listed by the trial registrant

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

Sleep-disordered breathing

Contacts and locations

Locations

  • National Center for Cardiology and Internal Medicine

    Bishkek, Bishkek, 720040, Kyrgyzstan

More trials for these conditions

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