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Can one workout change your gut bacteria?

NCT ID NCT06691100

Knowledge-focused Sponsor: George Washington University 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Sep 09, 2026 · Last updated Sep 10, 2026 · Updated 1 time

Summary

Researchers at George Washington University are studying how a single 30-minute aerobic exercise session affects gut bacteria and their metabolites in premenopausal women. The study includes 40 women with different fitness levels and body mass indexes, both with and without obesity. Participants cycle at a moderate intensity, and researchers measure changes in specific gut bacteria and short-chain fatty acids in stool and blood before and after exercise.

What this could mean

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

Active substance
a single 30-minute aerobic exercise session on a stationary bike
What this could lead to
If exercise changes gut bacteria or their metabolites, this could help explain how physical activity affects metabolism and weight in women.
What could go wrong
This small, short study cannot prove cause and effect, and results may not apply to other groups or longer exercise routines.

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 40 people

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

Started

Oct 2024

Expected to finish

Oct 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.

Ages

21 to 40 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: * Biological sex: female * BMI 19 to 24.99 kg/m2 or BMI 30-40 kg/m2 * Exercisers: Exercise at least 4 times per week for 60 minutes (a total of 240 minutes per week) on a programmed exercise training either on endurance sports (e.g., running, cycling, triathlon), strength (e.g., powerlifting), or team sports (e.g., rugby, football, soccer) * Non-Exercisers: Sedentary individuals who have not reached the PA guidelines (150 minutes of moderate-intensity physical activity a week, 75 minutes of vigorous-intensity physical activity, or an equivalent combination of moderate and vigorous-intensity physical activity). Exclusion Criteria: * Biological sex: male * BMI \< 19 kg/m2 or \> 40 kg/m2 * Currently pregnant, \< 2 years postpartum, lactating * Currently taking any herbal, fiber, or prebiotic supplement * Current or 1-month before the study, taking oral or vaginal antibiotics * Diagnosed with any gastrointestinal, endocrine, digestive, cancer, or cardiovascular disease.

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Conditions

The condition(s) this trial relates to.

Motor Activity Obesity obesity disorder

As listed by the trial registrant

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

Exercise Gut microbiome Gut microbiota Health Metabolome Obesity Weight management Women

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

  • Milken Institute School of Public Health, The George Washington University

    RECRUITING

    Washington D.C., District of Columbia, 20037, United States

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