肌肉痉挛又称抽筋，是运动中较为常见的一种症状。尤其是在田径、游泳、足球等一些时间长、强度大的运动项目上，发生率高。症发时，肌肉不自主地发生强直收缩，且不易放松。在运动中以小腿腓肠肌最易发生痉挛，其次是定底屈拇肌和屈趾肌。一产主的原因（一）隆昌活动不充为训 Muscle cramps, also known as cramps, is a more common form of exercise. Especially in track and field, swimming, football and some other time-consuming, intense sports, the high incidence. Symptoms, muscle involuntary dystrophy, and not easy to relax. In the movement to the calf gastrocnemius most likely to spasm, followed by the end of Dingji muscle and flexor muscle. A producer of the reasons (a) Longchang activities are not full of training