Amano Tatsuro, Gerrett Nicola, Inoue Yoshimitsu, Nishiyasu Takeshi, Havenith George, Kondo Narihiko
Eur J Appl Physiol. 2016 Feb;116(2):281-90. doi: 10.1007/s00421-015-3275-9.
The purpose of the present study was to develop and describe a simple method to evaluate the rate of ion reabsorption of eccrine sweat glands in human using the measurement of galvanic skin conductance (GSC) and local sweating rate (SR). This purpose was investigated by comparing the SR threshold for increasing GSC with following two criteria of sweat ion reabsorption in earlier studies such as (1) the SR threshold for increasing sweat ion was at approximately 0.2–0.5 mg/cm2/min and (2) exercise heat acclimation improved the sweat ion reabsorption ability and would increase the criteria 1.
Seven healthy non-heat-acclimated male subjects received passive heat treatment both before and after 7 days of cycling in hot conditions (50% maximum oxygen uptake, 60 min/day, ambient temperature 32 °C, and 50% relative humidity).
Subjects became partially heat-acclimated, as evidenced by the decreased end-exercise heart rate (p < 0.01), rate of perceived exhaustion (p < 0.01), and oesophageal temperature (p = 0.07), without alterations in whole body sweat loss, from the first to the last day of training. As hypothesized, we confirmed that the SR threshold for increasing GSC was near the predicted SR during passive heating before exercise heat acclimation, and increased significantly after training (0.19 ± 0.09–0.32 ± 0.10 mg/cm2/min, p < 0.05).
The reproducibility of sweat ion reabsorption by the eccrine glands in the present study suggests that the relationship between GSC and SR can serve as a new index for assessing the maximum rate of sweat ion reabsorption of eccrine sweat glands in humans.
本研究的目的是开发并描述一种简单的方法，通过测量皮肤电导率（GSC）和局部出汗率（SR）来评估人体外分泌汗腺的离子重吸收率。通过将GSC增加时的SR阈值与早期研究中以下两种汗液离子重吸收标准进行比较来研究该目的：（1）汗液离子增加时的SR阈值约为0.2–0.5 mg/cm2/分钟；（2）运动热适应可提高汗液离子重吸收能力，并会提高标准1。
7名健康的未热适应男性受试者在炎热条件下（最大摄氧量的50%，每天60分钟，环境温度32°C，相对湿度50%）进行7天的骑行前后均接受被动热疗。
从训练的第一天到最后一天，受试者出现了部分热适应，表现为运动结束时心率降低（p < 0.01）、主观疲劳率降低（p < 0.01）和食管温度降低（p = 0.07），而全身出汗量没有变化。正如所假设的，我们证实，在运动热适应前的被动加热过程中，GSC增加时的SR阈值接近预测的SR，并且在训练后显著增加（0.19±0.09–0.32±0.10 mg/cm2/分钟，p < 0.05）。
本研究中，外分泌腺汗液离子重吸收的可重复性表明，GSC与SR之间的关系可作为评估人体外分泌汗腺汗液离子最大重吸收率的新指标。
