The amount of sweat was studied in 18 healthy male athletes and 9 male workers during exerciseand work in hot environment (DB 27.7--39.2°C, RH 35.5%--66.2%) in summer. Meanwhile, Zn, Cu,Fe, K, Na, Ca and Mg were measured by atomic absorption spectrometry in sweat samples collectedby the arm-bag and leg-bag technique. The sweating rates, in ml/min, were 21.7, 18.3 and 8.2 withsignificant difference from each other among the three groups for VO_2 max exercise load test, longdistance run and work in hot enviro...