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Cycle secrets: study links period phases to muscle strength

NCT ID NCT07462286

Knowledge-focused Sponsor: Charles University, Czech Republic 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 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 looks at how different phases of the menstrual cycle relate to muscle strength and physical performance in healthy, active women aged 18 to 35. Participants will track their cycle with a phone app and attend three lab visits for strength tests and body measurements. The goal is to better understand natural changes during the cycle to help guide training and clinical care.

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

About 32 people

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

Expected to start

Apr 2026

An estimate. Start dates often move.

Expected to finish

Mar 2027

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.

Who is studied

Premenopausal women aged 18-35 years from the general population with occasional to recreational physical activity, recruited for repeated within-subject assessments across predefined menstrual cycle phases.

Ages

18 to 35 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.

Inclusion Criteria: * Female, age 18-35 years Premenopausal Occasional to recreational level of physical activity Willing and able to track menstrual cycle using a mobile application for approximately 2 months Willing and able to attend 3 laboratory visits scheduled to predefined menstrual cycle phases Able to provide written informed consent Exclusion Criteria: * Irregular menstrual cycle (outside protocol-defined regularity) Current pregnancy Use of hormonal medication for therapeutic purposes (per protocol) Current acute illness at time of testing Musculoskeletal injury of the lower limb limiting safe performance testing Contraindication to body composition assessment methods used in the study (e.g., BIA/DXA, per site protocol) Any other condition that, in the investigator's judgment, may interfere with safe participation or data quality

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Conditions

The condition(s) this trial relates to.

musculoskeletal system disorder

As listed by the trial registrant

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

Healthy volunteers Menstrual cycle Muscle strength Musculoskeletal system Physical performance

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

  • Faculty of Physical Education and Sport, Charles University, José Martího 269/31

    Prague, Prague, 16252, Czechia

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