Thermoregulatory Consequences of Upper Body Versus Lower Body Exercise

摘要

The purpose of this study was to examine the effects of exercise mode on heatstrain when cooling was provided by liquid-based microclimate cooling. Eight males exercised 20 min every half hour for a total of 120 min in a hot environment (49 deg C, 20% relative humidity) while dressed in a chemical protective overgarment. Subjects completed the following four tests: upper body exercise (UBE) with no cooling (NC), UBE with cooling (C), lower body exercise (LBE) with NC, and LBE with C. Work rates were selected to elicit an oxygen uptake of 1.2 L/min. Heart rate (HR), rectal temperature (T sub re), and whole body sweat rate (SR) were measured as heat strain indicators. Heat strain indices were similar between UBE and UBE when no cooling was provided. When cooling was provided, SR and T sub re were similar between exercise modes, but HR was