采用文献上典型的力竭性离心运动来训练４５只大鼠，用光镜、电镜观察运动后即刻，运动后２１小时以及４８小时，鼠比目鱼肌和股直肌的形态学结构。实验结果表明：运动组较对照组出现了明显的异常，且在４８小时内骨骼肌的这个异常变化有加重的趋势，运动后：２１～４８小时，快肌股直肌结构异常程度普遍不如慢肌比目鱼肌明显。 Forty-five rats were trained by typical exhaustive eccentric exercise in the literature. Morphological structures of the soleus and rectus muscle of rats were observed with light and electron microscopy immediately after exercise, at 21 hours and 48 hours after exercise. The experimental results show that there are obvious abnormalities in the exercise group compared with the control group, and the abnormal change of skeletal muscle tends to aggravate within 48 hours. After exercise, the abnormal muscle structure of the rectus femoris muscle is generally slower than that of the control group Muscle soleus muscle obvious.