Kamon E, Avellini B, Krajewski J
J Appl Physiol Respir Environ Exerc Physiol. 1978 Jun;44(6):918-25. doi: 10.1152/jappl.1978.44.6.918.
Heat-acclimated, lightly clothed men and women (four of each) walked on a treadmill at 25% and 43% VO2 max, respectively, (M =194 W.m-2), under seven air temperatures (Ta) ranging from 36 to 52 degrees C. Each experiment involved 1 h of fixed and a 2nd h of progressively increasing ambient vapor pressure (Pa). The relative steady state of rectal temperature (Tre), mean skin temperature (Tsk), and heart rate (HR) reached in the 1st h were forced upward during the 2nd h by the rising Pa. The critical air vapor pressure (Pcrit) was identified by the Tre point of inflection for each Ta. One man did not fully reach steady state, but inflection could be determined for his physiological responses. The mean values of all points of inflection were calculated for Tre, Tsk, and HR. Significant sex difference in HR was found only by excluding the results of the one man. Tre and Tsk showed no significant difference between men and women. The coefficient for evaporative heat transfer (he), which could be derived using the Pcrit for the low Ta range, was 14.5 +/- 2.2 W.m-1 Torr-1.
经过热适应、穿着轻便的男性和女性（各4名）分别在相当于最大摄氧量（VO₂ max）25%和43%的强度下（M = 194 W·m⁻²），在36至52摄氏度的七种气温（Ta）下在跑步机上行走。每个实验包括1小时的固定状态和第2小时逐渐升高的环境水汽压（Pa）。在第1小时达到的直肠温度（Tre）、平均皮肤温度（Tsk）和心率（HR）的相对稳定状态在第2小时因Pa上升而被迫上升。通过每个Ta下Tre的拐点确定临界水汽压（Pcrit）。一名男性未完全达到稳定状态，但可以确定其生理反应的拐点。计算了Tre、Tsk和HR所有拐点的平均值。仅通过排除该名男性的结果才发现HR存在显著性别差异。Tre和Tsk在男性和女性之间无显著差异。利用低Ta范围的Pcrit得出的蒸发散热系数（he）为14.5±2.2 W·m⁻¹ Torr⁻¹。
