本文运用“双盲”实验的方法,对短跑运动员在月经周期中运动能力的变化情况进行了研究。发现运动员的运动能力与体内孕酮的浓度呈正相关;与雌二醇的浓度呈负相关。在月经周期三个阶段运动能力在排卵后期最强,其次是月经后期,而排卵期则较差。 In this paper, we use “double-blind” experimental method to study the changes of sprinters’ exercise ability in menstrual cycle. It was found that the athletic ability of athletes was positively correlated with the concentration of progesterone in the body and negatively correlated with the concentration of estradiol. Menstrual cycle in the three stages of exercise capacity in the late ovulation strongest, followed by the late menstruation, and ovulation is poor.