Kamon E, Avellini B
J Appl Physiol. 1976 Jul;41(1):71-6. doi: 10.1152/jappl.1976.41.1.71.
Ten heat-acclimated females exercised seminude on a treadmill at 30% Vo2 max (M=152 W-m-2) under eight air temperatures (Ta) ranging from 30 degrees C to 52 degrees C. Each experiment involved 1 h of fixed and a 2nd h of progressively increasing water vapor pressure (Pw) with either air movement of 1 m-s-1 or still air. The equilibrium values of rectal temperature (Tre), mean skin temperature (Tsk),and heart rate (HR) reached in the 1st h were forced upwards in the 2nd h by the rising Pw. The critical Pw was defined by the Tre inflection point for each Ta. The loci of the critical Pw were used to delineate the thermal limits on the psychrometric chart and were used to derive the effective evaporative coefficient (Ke') applicable to the ambient capacity for evaporative cooling (Emax). The derived Ke' was 17.6 +/- 4.2 W-m-2 (mean +/- SD) for v0.6m-s-1. Isotherms constructed on the basis of the obtained Ké, Tsk, and sweating capacity were higher than the physiologically based Pw limits.
十名经过热适应的女性在跑步机上半裸运动，运动强度为最大摄氧量的30%（M = 152瓦·米⁻²），空气温度（Ta）范围为30摄氏度至52摄氏度，共八个温度水平。每个实验包括1小时的固定条件以及第二个小时，在风速为1米·秒⁻¹或静止空气条件下，水汽压（Pw）逐渐增加。在第一个小时达到的直肠温度（Tre）、平均皮肤温度（Tsk）和心率（HR）的平衡值，在第二个小时因Pw上升而被迫升高。临界Pw由每个Ta下的Tre拐点定义。临界Pw的轨迹用于在温湿图上划定热极限，并用于推导适用于环境蒸发冷却能力（Emax）的有效蒸发系数（Ke'）。对于风速0.6米·秒⁻¹，推导得到的Ke'为17.6 ± 4.2瓦·米⁻²（平均值 ± 标准差）。根据获得的Ké、Tsk和出汗能力构建的等温线高于基于生理的Pw极限。
