中长跑是典型的周期性、体能类的速度耐力项目,其突出的特征是: “高速度”持续跑的专项速度耐力。在训练及比赛中,中长跑运动员的能量供给主要以糖酵解为主,体内有大量乳酸堆积,若体内乳酸得不到及时缓冲或转化,体内的酸性物质增加,就会降低磷酸果糖激酶活性,减少能量生成导 Middle and long-distance running is a typical cyclical, physical class speed endurance project, its salient features are: “high speed ” continued to run the special speed endurance. In training and competitions, the energy supply of middle and long distance runners is dominated by glycolysis. There is a large amount of lactic acid accumulation in the body. If the body lactic acid can not be buffered or transformed in time, the increase of acidic substances in the body will reduce the phosphofructokinase activity , Reduce energy generation guide