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7、8月份是我国一年中气温最高的月份,南方一些省、区常出现异常高温天气,有时甚至超过40℃。在此高温环境下,人体体温调节失衡使机体大量蓄热,水盐代谢紊乱可导致中暑。虽然外界环境温度经常变化。但人体能够相对稳定地保持体温在正常限度以内。机体散热的主要方式是幅射、传导、对流和蒸发。当外界环境气温高于37℃时,散热困难,外环境热转移到体内,机体主要靠蒸发散热。出汗是非常重要的稳定内环境温度的机制,在不能以出汗散热的环境中操作,仅中等度的运动在1小时内就可使体温上升5～6℃,在高热、高湿度的
July and August are the months with the highest temperature in China in a year. In some southern provinces and autonomous regions, abnormally hot weather often occurs, sometimes exceeding 40 ℃. In this high temperature environment, the imbalance in body temperature regulation makes the body a large number of heat storage, water and salt metabolism disorders can lead to stroke. Although the external environment temperature often changes. However, the body can maintain a relatively stable body temperature within the normal limits. The main body of the heat radiation, conduction, convection and evaporation. When the ambient temperature is higher than 37 ℃, the heat is difficult to heat transfer to the outside environment, the body mainly by evaporation heat. Sweating is a very important mechanism for stabilizing the internal environment temperature. In environments that can not sweat and dissipate heat, only moderate exercise can raise the body temperature by 5 to 6 ° C within 1 hour. In sweaty, high-humidity