The effect of air temperature on physical working capacity.

摘要: Measurements were taken in ten healthy young male subjects, ages 20 to 25, under air temperature conditions of 5, 20, 35, and 50 degrees C. The relative humidity was maintained at 50% throughout all the conditions. Maximum work loads obtained by treadmills. first load 95 m/min 0 grade; this increased 1 degree every one minute until subjects reached a self-imposed maximum. heart rate expired sample during last 30 sec used for statistical analyses. analysis variance confirmed significance effect factor cases endurance time exhaustion, maximal oxygen uptake, carbon dioxide production, rate, respiratory exchange ratio, pulse. regression analyses disclosed following relationships between uptake (VO2 max) or (HR) temperature: VO2 max = 2472 + 29.5Ta-0.6Ta2(ml. STPD), HR 173 2.0Ta-0.09Ta2 0.001Ta3, where Ta shows centigrade. physiological mechanism underlying changes heat is discussed.