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Menstrual cycle changes with marathon training: anovulation and short luteal phase
Canadian Journal of Applied Sport Sciences. Journal Canadien Des Sciences Appliquees Au Sport
|September 1, 1982
Summary
Marathon training in women may be linked to menstrual cycle changes, including anovulatory (monophasic) and short luteal phases. These cycle abnormalities were associated with longer running mileage.
Area of Science:
- Reproductive endocrinology
- Sports medicine
- Exercise physiology
Background:
- Marathon training is a strenuous physical activity.
- Menstrual cycle regularity is crucial for female reproductive health.
- Previous studies suggest intense exercise can impact hormonal balance.
Purpose of the Study:
- To investigate the association between marathon training and menstrual cycle characteristics in women.
- To analyze basal body temperature (BBT), mileage, and weight changes in relation to cycle phases.
Main Methods:
- 14 women in a marathon clinic tracked BBT, mileage, and weight for 48 cycles.
- Entry criteria included age, gynecologic age, and no hormone use or recent weight change.
- BBT data analyzed using Vollman's criteria (1977) to assess cycle phases.
Main Results:
- 32/48 cycles were biphasic; 16 had normal luteal phase length (10-16 days), while 16 had short luteal phases (mean 6.4 days).
- 16/48 cycles were monophasic (anovulatory).
- Abnormal cycles (short luteal or monophasic) were associated with higher average running mileage (9.6-9.9 miles) compared to normal cycles (7.9 miles).
Conclusions:
- Marathon training may be associated with menstrual cycles that are normal in overall length but exhibit anovulatory or short luteal phases.
- Increased running mileage appears to be a factor in these cycle abnormalities.