Effects of low-intensity exercise on local skin and whole-body thermal sensation in hypothermic young males
Effects of low-intensity exercise on local skin and whole-body thermal sensation in hypothermic young males
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低强度运动对低体温青年男性局部皮肤及全身热感觉的影响
DOI：
10.1016/j.physbeh.2021.113531
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Nishiyasu Takeshi
中科院分区：
文献类型：
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作者：
Fujimoto Tomomi;Fujii Naoto;Dobashi Kohei;Cao Yinhang;Matsutake Ryoko;Takayanagi Masataka;Kondo Narihiko;Nishiyasu Takeshi
热感觉是行为体温调节的关键组成部分，是由皮肤和核心温度的变化调节的。尽管在运动时皮肤对局部寒冷的热感觉比在正常体温下的人休息时迟钝，但在核心冷却时是否如此仍有待确定。此外，当运动过程中局部皮肤热感觉减弱时，全身热感觉是否也减弱尚不清楚。因此，我们测试了低强度运动（VO2: ~1300 ml min - 1）是否会减弱体温过低的年轻男性的局部皮肤和/或全身热感觉。11名健康年轻男性（24±2岁）在休息（休息试验）和低强度循环（30 - 60 W, 30 rpm）（运动试验）时，通过18°C的冷水浸泡至下腹。在陆地基线、浸泡期间食管温度（Tes）开始下降（定义为-0.0Tes）之前和0.5°C和1.0°C之后，测量体温、心肺变量、全身（9分制：0，难以忍受的冷；4，中性；8，难以忍受的热）和局部皮肤热感觉。局部皮肤热感觉测量使用热刺激器与珀尔帖元件，附着在胸部。探针的温度最初与胸部皮肤温度平衡，然后以恒定的速率（0.1°c -1）逐渐降低，直到参与者感到凉爽。初始皮肤温度与感觉凉爽的局部皮肤温度之间的差异被评估为局部皮肤热感觉的指标。在整个浸泡过程中，食道温度和平均皮肤温度在休息和运动试验之间没有差异。局部皮肤热感觉在两个试验之间或在任何核心温度水平上也没有差异。相比之下，在食道温度为-1.0℃时，运动组的全身热感觉评分高于其他试验（1.25±0.46比0.63±0.35单位，P= 0.035）。这些结果表明，在低强度运动时，局部皮肤热感觉不受核心温度降低的影响。然而，在冷水浸泡期间，低强度的运动会减弱由核心温度降低（-1.0℃）介导的全身热感觉。
Thermal sensation, a key component of behavioral thermoregulation, is modulated by the changes in both skin and core temperatures. Although cutaneous thermal sensation to local cold is blunted during exercise as compared to rest in normothermic humans, it remains to be determined whether this holds true during core cooling. Furthermore, when local skin thermal sensation is diminished during exercise, it remains unclear whether whole-body thermal sensation is also attenuated. We therefore tested whether low-intensity exercise (VO2: ~1300 ml min−1) attenuates local skin and/or whole-body thermal sensation in hypothermic young males. Eleven healthy young males (24 ± 2 years) were cooled through cold water immersion (18 °C) up to their lower abdomen while resting (rest trial) and during low-intensity cycling (30–60 W, 30 rpm) (exercise trial). Body temperature, cardiorespiratory variables, and whole-body (9-point scale: 0, unbearably cold; 4, neutral; 8, unbearably hot) and local skin thermal sensation were measured at baseline on land and before the esophageal temperature (Tes) began to decrease (defined as -0.0Tes) and after 0.5 and 1.0 °C decrements inTesfrom baseline during the immersion period. Local skin thermal sensation was measured using a thermostimulator with Peltier element that was attached to the chest. The temperature of the probe was initially equilibrated to the chest skin temperature, then gradually decreased at a constant rate (0.1 °Cs-1) until the participants felt coolness. The difference between the initial skin temperature and the local skin temperature that felt cool was assessed as an index of local skin thermal sensation. Throughout the immersions, esophageal and mean skin temperatures did not differ between the rest and exercise trials. Local skin thermal sensation also did not differ between the two trials or at any core temperature level. By contrast, the whole-body thermal sensation score was higher (participants felt less cold) in the exercise than in the rest trial at esophageal temperature of -1.0 °C (1.25 ± 0.46 vs. 0.63 ± 0.35 units,P= 0.035). These results suggest that local skin thermal sensation during low-intensity exercise is not affected by a decrease in core temperature. However, whole-body thermal sensation mediated by a decrease in core temperature (-1.0 °C) is blunted by low-intensity exercise during cold water immersion.