国外专家调查,从事较大运动量的少女,月经异常者占相当大的比例,多表现为月经初潮延迟、周期不规则、继发性闭经等,且运动量愈大初潮年龄越晚。其原因主要是由于强烈运动会抑制下丘脑功能,造成内分泌系统功能异常,影响体内性激素的正常水平,从而干扰了正常月经的形成和周期。同时影响月经异常的原因还有很多,比如下面的一些因素: Survey of foreign experts, engaged in a large amount of exercise of girls, abnormal menstruation accounted for a large proportion, mostly manifested as delayed menarche, irregular cycles, secondary amenorrhea, and the greater the amount of exercise, the age of menarche. The reason is mainly due to strong exercise will inhibit the function of the hypothalamus, causing endocrine system dysfunction, affecting the normal levels of sex hormones in the body, thus interfering with the normal menstrual cycle and formation. At the same time there are many reasons for abnormal menstruation, such as the following factors: