Laboratory for Applied Human Physiology, Graduate School of Human Development and Environment, Kobe University, 3-11 Tsurukabuto, Nada-Ku, Kobe, 657-8501, Japan.
Laboratory for Exercise and Environmental Physiology, Faculty of Education, Niigata University, Niigata, Japan.
Eur J Appl Physiol. 2019 Mar;119(3):685-695. doi: 10.1007/s00421-018-04059-5. Epub 2019 Feb 7.
Changes in mean skin temperature (T) have been shown to modify the maximum rate of sweat ion reabsorption. This study aims to extend this knowledge by investigating if modifications could also be caused by local T.
The influence of local T on the sweat gland maximum ion reabsorption rates was investigated in ten healthy volunteers (three female and seven male; 20.8 ± 1.2 years, 60.4 ± 7.7 kg, 169.4 ± 10.4 cm) during passive heating (water-perfused suit and lower leg water immersion). In two separate trials, in a randomized order, one forearm was always manipulated to 33 °C (Neutral), whilst the other was manipulated to either 30 °C (Cool) or 36 °C (Warm) using water-perfused patches. Oesophageal temperature (T), forearm T, sweat rate (SR), galvanic skin conductance (GSC) and salivary aldosterone concentrations were measured. The sweat gland maximum ion reabsorption rates were identified using the ∆SR threshold for an increasing ∆GSC.
Thermal [T and body temperature (T)] and non-thermal responses (aldosterone) were similar across all conditions (p > 0.05). A temperature-dependent response for the sweat gland maximum ion reabsorption rates was evident between 30 °C (0.18 ± 0.10 mg/cm/min) and 36 °C (0.28 ± 0.14 mg/cm/min, d = 0.88, p < 0.05), but not for 33 °C (0.22 ± 0.12 mg/cm/min), d = 0.44 and d = 0.36, p > 0.05.
The data indicate that small variations in local T may not affect the sweat gland maximum ion reabsorption rates but when the local T increases by > 6 °C, ion reabsorption rates also increase.
已证明平均皮肤温度（T）的变化会改变汗液离子重吸收的最大速率。本研究旨在通过研究局部 T 是否也会引起变化来扩展这方面的知识。
在 10 名健康志愿者（3 名女性和 7 名男性；20.8±1.2 岁，60.4±7.7kg，169.4±10.4cm）中，通过被动加热（水灌注服和小腿水浸）研究局部 T 对汗腺最大离子重吸收率的影响。在两项单独的试验中，按照随机顺序，一只前臂始终被控制在 33°C（中性），而另一只前臂则使用水灌注贴片分别控制在 30°C（凉爽）或 36°C（温暖）。测量食管温度（T）、前臂 T、出汗率（SR）、皮肤电导（GSC）和唾液醛固酮浓度。通过增加的 ∆GSC 确定 ∆SR 阈值来识别汗腺最大离子重吸收率。
在所有条件下，热（T 和体温（T））和非热（醛固酮）反应相似（p>0.05）。在 30°C（0.18±0.10mg/cm/min）和 36°C（0.28±0.14mg/cm/min，d=0.88，p<0.05）之间，出汗腺最大离子重吸收率存在温度依赖性反应，但在 33°C（0.22±0.12mg/cm/min）时则不然，d=0.44 和 d=0.36，p>0.05。
数据表明，局部 T 的微小变化可能不会影响汗腺最大离子重吸收率，但当局部 T 升高超过 6°C 时，离子重吸收率也会升高。
