Gavhed D C, Nielsen R, Holmér I
Department of Work Physiology, National Institute of Occupational Health, Solna, Sweden.
Eur J Appl Physiol Occup Physiol. 1991;63(1):29-35. doi: 10.1007/BF00760797.
Thermoregulatory and thermal subjective responses were studied in ten male, clothed subjects during continuous (C) and intermittent (I) exercise at the same average level of oxygen consumption. The subjects performed both I and C twice, dressed in two different three-layer cold-protective clothing ensembles of two thermal insulation levels [total clothing insulation = 2.59 clo (L) and 3.20 clo (H)]. Experiments were carried out at an ambient temperature of -10 degrees C. Rectal temperatures increased similarly in both types of exercise. Mean skin temperature (Tsk) was lower in I compared to C with both levels of clothing insulation. Over the last 0.5 h of the experiment Tsk was approximately 1.3 degrees C lower in I than in C for clothing L. The skin evaporation rate was higher in clothing H than L but did not differ between I and C. Subjective ratings for thermal sensations of the whole body (BTS) and hands were close to neutral in I and around slightly warm in C. The BTS was lower in I than in C and was lower in L compared to H. It was concluded that, at equal average energy expenditure, thermal responses to intermittent and continuous exercise in the cold differ in clothed subjects, principally as a result of different patterns of heat exchange.
在10名身着衣物的男性受试者进行相同平均耗氧量的持续（C）和间歇（I）运动期间，对其体温调节和热主观反应进行了研究。受试者分别穿着两种不同隔热水平的三层防寒服装套装[总服装隔热 = 2.59 clo（低隔热，L）和3.20 clo（高隔热，H）]，对I和C运动各进行两次。实验在环境温度为-10摄氏度的条件下进行。两种运动类型中直肠温度的升高情况相似。在两种服装隔热水平下，I运动时的平均皮肤温度（Tsk）均低于C运动。在实验的最后0.5小时，对于低隔热服装L，I运动时的Tsk比C运动时低约1.3摄氏度。高隔热服装H的皮肤蒸发率高于低隔热服装L，但I和C运动之间没有差异。I运动时全身（BTS）和手部的热感觉主观评分接近中性，C运动时则略偏温暖。BTS评分I运动低于C运动，低隔热服装L低于高隔热服装H。得出的结论是，在平均能量消耗相等的情况下，寒冷环境中身着衣物的受试者对间歇运动和持续运动的热反应不同，主要是由于不同的热交换模式所致。
