Abstract
The purpose of this study was to investigate the effect of air temperature on maximal oxygen intake. Ten adult males were used as subjects. The maximal oxygen intake was measured at 10°C, 20°C, 30°C, 40°C, and 50°C of air temperature, all at 50% of relative humidity. The largest value of maximal oxygen intake was obtained at an air temperature of 30°C and was significantly greater than the value at 20°C and 40°C. A polynomial equation was used to calculate the critical temperatures. The lower critical temperature was 23.6°C and the upper 36.7°C. The critical temperatures for maximal heart rate and maximal work time were calculated by the same method.
