Should you sync your workouts to your cycle? new study seeks answers

NCT ID NCT05697263

Recruiting now Knowledge-focused Sponsor: Karolinska Institutet Source: ClinicalTrials.gov ↗

First seen Jun 25, 2026 · Last updated Aug 14, 2026 · Updated 3 times

Summary

This study looks at whether scheduling workouts based on menstrual cycle phases improves fitness in women who exercise regularly. About 111 female athletes will follow different training schedules over three cycles. Researchers will measure changes in aerobic fitness, muscle strength, and body composition. The goal is to provide reliable, evidence-based advice for female athletes.

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 provide clear, evidence-based guidance on whether tailoring workouts to menstrual cycle phases improves athletic performance.
What could go wrong: This is an early-stage, observational-style trial with no treatment. Results may show no benefit from periodization, and findings may not apply to all athletes.

This is an AI summary of the original study and may miss details. Read our disclaimer.

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Conditions

The condition(s) this trial relates to.

Motor Activity

As listed by the trial registrant

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

ATHLETIC PERFORMANCE EXERCISE MENSTRUAL CYCLE WOMEN'S HEALTH

Contacts and locations

Locations

Angelica Lindén Hirschberg
RECRUITING

Stockholm, 17176, Sweden

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