长跑是一种耐力性项目。长跑时，人体的代谢加快，呼吸系统和循环系统发生适应性变化，血液流向下肢，供给肌肉活动的能量。长跑后体内的肌糖元及血糖大幅度下降，跑的距离越长，体内的能量消耗就越大，一般来说，要消除大运动量长跑所产生的生理性疲劳约需８小时的休息。... Long-distance running is a type of endurance project. Long-distance running, the body’s metabolism to speed up the adaptive changes in the respiratory system and circulatory system, blood flow to the lower limbs, the energy supply of muscle activity. In the body after long-distance muscle glycogen and blood glucose dropped significantly, the longer the distance running, the greater the energy consumption in the body, in general, to eliminate the physical activity of large-scale long-distance running fatigue takes about 8 hours of rest. ...