Experiment studies on sweating for exercise prescription: total body sweat rate in relation to work load in physically trained adult males.

This study was designed to examine whether or not the total body sweat rate can be used as a practical index for prescribing exercise. The sweat rate was experimentally studied in relation to factors such as intensity of exercise, the secretory capacity of sweating mechanism, and body temperature. After determining the maximum sweating rate on the whole body surface, regarded as the secretory capacity of the sweating mechanism, each physically trained subject was made to pedal a bicycle ergometer for 60 min at each of several kinds of mechanical work rates under fixed hot climatic conditions in summer. Total body sweat rate, rectal temperature, and RMR were measured during the experiment. The sweat secreting index (SSI), which is ratio of total body sweat rate to maximum sweat rate, was calculated, and was presumed to indicate the functioning rate of sweat secretory capacity. The total body sweat rate responded to factors such as RMR, SSI, and rectal temperature with a high correlation coefficient. From these results it was concluded that the total body sweat rate can be used as a practical index for prescribing exercise.