Research
Hormonal
Strenuous exercise induces menstrual disorders (amenorrhea or oligomenorrhea) in untrained women, primarily through energy deficiency and subsequent suppression of gonadotropin secretion.
If you are new to exercise, do not suddenly start exercising intensely while eating the same amount as before. Your body may stop ovulating if you create a large energy deficit. Ensure you eat enough to support your activity level to maintain menstrual health.
GoodSupportsHIGH confidence
Strenuous exercise induced menstrual disorders in 10 of 12 untrained women... The menstrual disorders were associated with a negative energy balance and a decrease in the secretion of gonadotropins.
Why this rating
Small sample size (n=12) but rigorous physiological monitoring and controlled conditions.
Source
Induction of Menstrual Disorders by Strenuous Exercise in Untrained Women
Beverly A. Bullen et al. · New England Journal of Medicine · 1985
DOI 10.1056/nejm198505233122103
clinical_trialCited 487×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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