Does exercising on an empty tank mess with your period?

NCT ID NCT06471582

Recruiting now Knowledge-focused Sponsor: University of Colorado, Colorado Springs Source: ClinicalTrials.gov ↗

First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study looks at how exercising without eating beforehand (fasted) might change menstrual hormones and cycle length in women who regularly run or cycle. Over about 3 months, 64 participants will track their cycles, complete three 90-minute exercise sessions either fed or fasted, and provide saliva samples. The goal is to understand how energy timing affects reproductive health, not to test a treatment.

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Conditions

The condition(s) this trial relates to.

menstrual disorder Menstruation Disturbances

As listed by the trial registrant

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

MENSTRUAL IRREGULARITY

Contacts and locations

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Study contacts

Contact

Phone: •••-•••-•••• Email: •••••@•••••

Locations

William J. Hybl Sports Medicine and Performance Center
RECRUITING

Colorado Springs, Colorado, 80918, United States

Contact Phone: •••-•••-•••• Email: •••••@•••••