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人体在进行体育活动时,不仅消耗大量的热能,同时也丧失大量的水分。特别是夏季天热,机体内失水更多。这就会引起各部器官,主要是中枢神经系统机能降低,出现抽筋、四肢无力、工作能力下降等现象。据测定水占成人体重的65％左右。当失水占体重的4％～5％时,肌肉工作能力下降约20％～30％;当失水至体重10％时,则会造成循环衰竭。因此,在运动中和运动后如何补充水分,是一个不可忽略和值得重视的问题。
When doing physical activities, the human body not only consumes a lot of heat, but also loses a lot of water. Especially in summer heat, the body more water loss. This will cause various organs, mainly central nervous system function decline, there cramps, weakness, decreased ability to work and so on. According to the measured water accounted for about 65% of adult weight. When the loss of water accounts for 4% to 5% of body weight, the working ability of the muscle is reduced by about 20% to 30%. When the loss of water to 10% of the body weight results in circulatory failure. Therefore, how to replenish water during and after exercise is a problem that can not be ignored and worth paying attention to.