流行病学调查揭示持续性受卵巢激素影响,是乳腺癌发病的重要因素。体育活动能调节月经周期的类型,改变卵巢激素的产生,可以降低乳腺癌的发病;然而仅有极少数流行病学资料证实了这种关系。本研究目的是确定40岁及40岁以下的妇女,在生育期有规律地参加体育锻炼活动,能否降低乳腺癌的发病。 自1983年7月1日到1989年1月1日确诊为原位或浸润性乳腺癌的545例妇女 Epidemiological surveys have revealed that sustained ovarian hormone effects are important factors in the pathogenesis of breast cancer. Physical activity can regulate the type of menstrual cycle and change the production of ovarian hormones, which can reduce the incidence of breast cancer; however, only a few epidemiological data confirm this relationship. The purpose of this study is to identify women 40 years of age and under 40 years of age who regularly participate in physical exercise during the reproductive period and whether they can reduce the incidence of breast cancer. 545 women diagnosed with in situ or invasive breast cancer from July 1, 1983 to January 1, 1989