运动训练或比赛时，运动员水盐代谢旺盛，丧失水份很多。合理而及时地补充水分不仅有助于血量的维持，对机体的血液循环和散热也是极为有利的。相反，如果当体内失水不能及时补充时，就会引起血液浓缩、脉率加快、体温升高、运动能力下降、易发生疲劳。运动前，要合理地补充水 Sports training or competition, athletes water and salt metabolism, loss of water a lot. Reasonable and timely replenishment of water not only contribute to the maintenance of blood, the body’s blood circulation and cooling is also extremely beneficial. On the contrary, if the body water loss can not be replenished in time, it will cause blood concentration, pulse rate, body temperature, decreased exercise capacity, prone to fatigue. Before exercise, to be reasonable to add water