Kondo N, Shibasaki M, Aoki K, Koga S, Inoue Y, Crandall C G
Laboratory for Applied Human Physiology, Faculty of Human Development, Kobe University, Kobe 657-8501, Japan.
J Appl Physiol (1985). 2001 May;90(5):1877-81. doi: 10.1152/jappl.2001.90.5.1877.
The purpose of this study was to identify the pattern of change in the density of activated sweat glands (ASG) and sweat output per gland (SGO) during dynamic constant-workload exercise and passive heat stress. Eight male subjects (22.8 +/- 0.9 yr) exercised at a constant workload (117.5 +/- 4.8 W) and were also passively heated by lower-leg immersion into hot water of 42 degrees C under an ambient temperature of 25 degrees C and relative humidity of 50%. Esophageal temperature, mean skin temperature, sweating rate (SR), and heart rate were measured continuously during both trials. The number of ASG was determined every 4 min after the onset of sweating, whereas SGO was calculated by dividing SR by ASG. During both exercise and passive heating, SR increased abruptly during the first 8 min after onset of sweating, followed by a slower increase. Similarly for both protocols, the number of ASG increased rapidly during the first 8 min after the onset of sweating and then ceased to increase further (P > 0.05). Conversely, SGO increased linearly throughout both perturbations. Our results suggest that changes in forearm sweating rate rely on both ASG and SGO during the initial period of exercise and passive heating, whereas further increases in SR are dependent on increases in SGO.
本研究的目的是确定在动态恒定负荷运动和被动热应激期间，激活汗腺（ASG）密度和每个腺体出汗量（SGO）的变化模式。八名男性受试者（22.8±0.9岁）在恒定负荷（117.5±4.8W）下运动，并在环境温度25℃、相对湿度50%的条件下，通过将小腿浸入42℃热水中进行被动加热。在两项试验过程中持续测量食管温度、平均皮肤温度、出汗率（SR）和心率。出汗开始后每4分钟测定一次ASG的数量，而SGO通过将SR除以ASG来计算。在运动和被动加热过程中，出汗开始后的前8分钟内SR均急剧增加，随后增加速度减慢。两种方案的情况类似，出汗开始后的前8分钟内ASG数量迅速增加，然后不再进一步增加（P>0.05）。相反，在两种干扰过程中SGO均呈线性增加。我们的结果表明，在运动和被动加热的初始阶段，前臂出汗率的变化依赖于ASG和SGO，而SR的进一步增加则取决于SGO的增加。
