Malhotra M S, Sridharan K, Venkataswamy Y
Aviat Space Environ Med. 1976 May;47(5):503-4.
Six healthy, heat-acclimatized subjects were exposed to different hot and humid environments in a climatic chamber and sodium, potassium, and chloride concentrations in their sweat, urine, and blood were determined. The concentration of potassium in sweat was found to be considerably higher than that in the plasma, whereas that of sodium and chloride was very much lower. The concentration of potassium in urine was also 8-12 times higher than that in the plasma as compared to 0.5 to 1.5 times higher for sodium and chloride. The total daily computed losses of potassium in sweat and urine, of a person working in severe heat in the tropics, can be about 116 mEq as against a dietary intake of 97 mEq/d, thereby resulting in negative potassium balance. The potassium depletion in sweat, even in acclimatized Indians, is thus heavy and is likely to play an important role in the causation of heat-illness.
六名健康且适应热环境的受试者被置于气候舱内的不同高温高湿环境中，并测定了他们汗液、尿液和血液中的钠、钾和氯浓度。发现汗液中的钾浓度远高于血浆中的钾浓度，而钠和氯的浓度则低得多。尿液中的钾浓度也比血浆中的高8 - 12倍，而钠和氯仅高0.5至1.5倍。在热带地区从事重体力劳动的人，汗液和尿液中钾的每日计算总损失量约为116毫当量，而饮食摄入量为97毫当量/天，从而导致钾平衡为负。因此，即使是适应热环境的印度人，汗液中的钾消耗也很大，可能在热疾病的病因中起重要作用。
