Fitness
Follicular Phase Endurance Window
The follicular phase endurance window may suit harder aerobic work after menses for some athletes—always secondary to sleep, fueling, and iron.
The follicular phase endurance window is when rising estrogen coincides with easier heat tolerance and stable breathing for some runners and cyclists in the two weeks after bleeding. It can host threshold or long zone-2 blocks if symptoms and iron status are solid—not a guarantee.
Illness and sleep debt override hormones.
Common questions
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Should long runs happen only after your period?
Schedule long efforts when recovery and fueling are strong. Follicular timing is a hint from your logs, not a calendar law.
Related terms
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