Some Physiological Reactions by Exercise under Wind

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Interested in the influences of wind on human body under exercise, the present authors had prepared a handmade wind tunnel with air conditionning and studied some physiological reactions under wind. Five healthy male subjects (aged 22-24 yrs.) were loaded with a bicycle ergometer work at the rate of 600 kpm/min for 30 minutes, under three different wind velocities (no wind: W0, 3.8m/sec: W1 and 5.7 m/sec: W2), with an air conditionning of temperature: 24°C, relative humidity: 60%. Following results were obtained: 1) Heart rate decreased by wind (at W0: 128, W1: 121 and W2: 120 beats/min) ; but oxygen intake remained constant (1.5-1.6l/min) . 2) Mean skin temperature kept a certain level rather lower under wind and the change of rectal temperature was not observed. 3) Total sweat rate and local sweat rate showed a decrease by wind, but Na and Cl concentrations in sweat did not change, though there were individual differences. 4) Heat Tolerance Index (HTI) decreased under wind. 5) Under wind, the heat loss by evaporation and convection decreased double and that by radiation decreased to about 1/3 compared with the no wind conditions.
日本生気象学会の論文