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According to the results of questionnaires to college athletes, they believe the follicular phase is better than luteal phase for competitive sports. However, it is not clear whether there is significant difference in athletic performance between the two phases of the menstrual cycle. The effects of the menstrual cycle on the cardiorespiratory system were investigated in exercising women who are top players of basketball in Japan. They performed incremental exercise on a cycle ergometer. During the exercise, the ECG and heart rate (HR) were monitored. The expired air was sampled continuously and expiratory gas volume/minute (VE), oxygen uptake (VO2), carbon dioxide output (VCO2), gas exchange ratio(R) and respiratory rate (Resp. E.) were measured. Blood samples were collected to measure the blood lactic acid concentration during the exercise. HR in the luteal phase is higher than in the follicular phase at rest and throughout the exercise. VE, R and Resp. R. at rest and during exercise indicated a tendency to a higher level in the follicular phase. The blood lactic acid concentration during exercise in the follicular phase indicated a tendency to increase more rapidly than in luteal phase. However, no statistical differences in the cardiorespiratory system were detected when the follicular and luteal phase were compared. These results did not indicate conclusively in which phase it is better for athletic women to take part in competitive sports.
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