This paper reports the loss of several major nutrients in the sweat from humanbody during working in hot environment,so as to put forward a rational scheme for sup-plying beverages and foods with appropriate nutrients.Thirteen young male subjectsdressed in gas protection equipment of the whole body were ordered to march in a hotclimatic chamber（DB 34.2℃）at a speed of 5.4 km/h until they subjectively failed to bearfurther but to hold on still for 200 m.The results showed that their maximum tolerancetime was only 58.2±2.9 min,the mean body temperature（MBT）was 37.8±0.1 ℃,heartrate（HR）151.3±8.0 beat/min.Nevertheless,the amount of sweat was only 780.5±75.2 g.Thelevels of K,Na,Ca,Mg,Fe,Cu and Zn in the whole body-sweat of our series were12.3±1.8,113.0±7.0,0.8±0.13,0.9±0.20,0.027±0.004,0.005±0.001 and 0.035±0.002mmol/L,respectively.The concentrations of K and Zn in serum were decreased,and thelevel of Zn was also lower than the normal.The total amount of amino acids in thesweat was 10855±679 μmol/L,of which the amount of essential amino acids was 21.2%.The concentration of lysine was the highest（1038.5±90.7μmol/L）,and that of methioninethe lowest（49.8±4.0μmol/L）in the essential amino acids.In the non-essential aminoacids,the concentrations of serine and glycine were the highest,being 2774.3±179.0 and1572.1±83.9 μmol/L,respectively,and that of cystine the lowest,being 4.8±0.9μmol/L.The amount of vitamins B1,B2 and C in the sweat were only 452±220,312±174 and3330±1200 μg/L,respectively.
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