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Female athlete study: hormones may change strength and hydration

NCT ID NCT07591818

Knowledge-focused Sponsor: Faculdade de Motricidade Humana Source: ClinicalTrials.gov ↗

What the study statuses mean

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Recruitment status, easiest to join first

Recruiting now This study
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
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 natural menstrual cycles and birth control pills affect strength, hydration, and energy balance in 40 female athletes. Researchers will measure muscle strength, body water, and energy use at different times of the month. The goal is to better understand how hormones influence performance and health, which could lead to better training and nutrition advice for women.

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 study could help coaches and athletes tailor training and nutrition strategies based on hormonal phases, improving performance and health.
What could go wrong
This is an observational study with only 40 participants, so findings may not apply to all athletes. It measures associations, not cause and effect.

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 40 people

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

Started

Apr 2026

Expected to finish

Jun 2028

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

The study population will consist of 40 female athletes aged 18 to 30 years. Participants will be recruited through Portuguese sports federations and the Portuguese Commission of Olympic Athletes. All participants will be classified as at least Tier 2 athletes with a minimum of one year of federated sports participation. Participants will be allocated into two groups according to menstrual and hormonal status:i) Natural menstrual cycle group (n = 24); ii) Oral contraceptive users group (n = 16). All participants will be cisgender women, biologically female, and not undergoing gender-transition therapy.

Ages

18 to 30 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: * Cisgender female individuals (biologically female, not undergoing gender-transition therapy) * Age between 18 and 30 years; * Classified as at least Tier 2 athletes; * Minimum of 1 year of federated sports participation; * Menarche occurred at least 3 years prior to enrollment; Additional inclusion criteria for the natural menstrual cycle group: * Menstrual cycle length between 21 and 35 days with at least nine consecutive cycles in the previous year; * Confirmed ovulatory cycle (luteinizing hormone surge and progesterone \>16 nmol/L); Additional inclusion criteria for the oral contraceptive group: * Use of combined monophasic oral contraceptives with a 21-day regimen; * Use of the same oral contraceptive for at least 3 months prior to enrollment; Exclusion Criteria: * Pregnancy or child birth within the previous 12 months; * Active smoking; * Diagnosis of metabolic, cardiovascular, or respiratory disease: * Use of continuous or extended-cycle oral contraceptives.

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Conditions

The condition(s) this trial relates to.

tinea pedis

As listed by the trial registrant

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

Athlete Menstrual cycle Oral contraceptive use

How to take part

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  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

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Contacts and locations

Locations

  • Faculdade de Motricidade Humana

    RECRUITING

    Cruz Quebrada, Oeiras, 1495-751, Portugal

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