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Thermal Comfort Under Weightlessness Exposure: A Discriminant Analysis
Microgravity Science and Technology ( IF 1.8 ) Pub Date : 2021-06-21 , DOI: 10.1007/s12217-021-09891-7
Hui Zhu , Mingle Hu , Linsheng Huang , Zehua Liu , Hua Su

Astronauts under weightlessness or microgravity would have differences in thermal comfort due to several adaptive physiological changes caused by the absence of the gravity. In this study, the Mahalanobis distance discriminant was conducted to investigate the classifications of the mean thermal comfort votes (MTCV) in weightlessness, in terms of the ratio of low-frequency power (LF) and high-frequency power (HF) of the heart rate variability (HRV). The ratio was abbreviated as LF/HF and it represented the balance of the autonomous nervous system and acted as an indicator of the thermal comfort. This study was based on our previous research data that had been acquired from 6 male participants under simulated weightlessness through heard-down bed rest (HDBR) model. Results showed that when LF/HF < 1.442, participants under simulated weightlessness gave comfort feedbacks, including the neutral comfort and warm comfort, while participants under normal condition felt thermally comfort when LF/HF ≤ 1.232 and felt uncomfortable thereafter. When 1.442 < LF/HF < 2.073, all participants under simulated weightlessness reported cool comfort. When the mean LF/HF was greater than 2.073, however, participants under simulated weightlessness reported thermal discomfort. In addition, results indicated that participants under simulated weightlessness could not distinguish neutral comfort from warm comfort, but they could report the cool comfort quickly, which suggested that the human body in weightlessness might be more sensitive to the cool environments. Finally, the corresponding comfortable air temperature (ta) range under simulated weightlessness was estimated as 26℃ ≤ ta < 30℃ according to the discriminant results of the MTCV.



中文翻译:

失重暴露下的热舒适度:判别分析

由于重力缺失引起的几种适应性生理变化,宇航员在失重或微重力下的热舒适度会有所不同。在这项研究中,根据心脏的低频功率 (LF) 和高频功率 (HF) 的比率,进行马哈拉诺比斯距离判别式以研究失重时平均热舒适投票 (MTCV) 的分类率变异性 (HRV)。该比率缩写为LF/HF,它代表自主神经系统的平衡,并作为热舒适度的指标。这项研究基于我们之前的研究数据,这些数据是通过仰卧床休息 (HDBR) 模型从 6 名男性参与者在模拟失重下获得的。结果表明,当 LF/HF < 1.442 时,模拟失重下的被试给出舒适反馈,包括中性舒适和暖舒适,正常状态下被试在LF/HF≤1.232时感觉热舒适,之后感觉不舒服。当 1.442 < LF/HF < 2.073 时,模拟失重下的所有参与者都报告了凉爽的舒适感。然而,当平均 LF/HF 大于 2.073 时,模拟失重下的参与者报告了热不适。此外,结果表明,模拟失重下的参与者无法区分中性舒适和温暖舒适,但他们可以快速报告凉爽舒适,这表明失重下的人体可能对凉爽环境更敏感。最后是相应的舒适气温(包括中性舒适度和温暖舒适度,正常情况下被试在LF/HF≤1.232时感觉热舒适,之后感觉不舒服。当 1.442 < LF/HF < 2.073 时,模拟失重下的所有参与者都报告了凉爽的舒适感。然而,当平均 LF/HF 大于 2.073 时,模拟失重下的参与者报告了热不适。此外,结果表明,模拟失重下的参与者无法区分中性舒适和温暖舒适,但他们可以快速报告凉爽舒适,这表明失重下的人体可能对凉爽环境更敏感。最后是相应的舒适气温(包括中性舒适度和温暖舒适度,正常情况下被试在LF/HF≤1.232时感觉热舒适,之后感觉不舒服。当 1.442 < LF/HF < 2.073 时,模拟失重下的所有参与者都报告了凉爽的舒适感。然而,当平均 LF/HF 大于 2.073 时,模拟失重下的参与者报告了热不适。此外,结果表明,模拟失重下的参与者无法区分中性舒适和温暖舒适,但他们可以快速报告凉爽舒适,这表明失重下的人体可能对凉爽环境更敏感。最后是相应的舒适气温(232,此后感到不舒服。当 1.442 < LF/HF < 2.073 时,模拟失重下的所有参与者都报告了凉爽的舒适感。然而,当平均 LF/HF 大于 2.073 时,模拟失重下的参与者报告了热不适。此外,结果表明,模拟失重下的参与者无法区分中性舒适和温暖舒适,但他们可以快速报告凉爽舒适,这表明失重人体可能对凉爽环境更敏感。最后,相应的舒适气温(232 之后感到不舒服。当 1.442 < LF/HF < 2.073 时,模拟失重下的所有参与者都报告了凉爽的舒适感。然而,当平均 LF/HF 大于 2.073 时,模拟失重下的参与者报告了热不适。此外,结果表明,模拟失重下的参与者无法区分中性舒适和温暖舒适,但他们可以快速报告凉爽舒适,这表明失重下的人体可能对凉爽环境更敏感。最后,相应的舒适气温(模拟失重下的参与者报告了热不适。此外,结果表明,模拟失重下的参与者无法区分中性舒适和温暖舒适,但他们可以快速报告凉爽舒适,这表明失重下的人体可能对凉爽环境更敏感。最后是相应的舒适气温(模拟失重下的参与者报告了热不适。此外,结果表明,模拟失重下的参与者无法区分中性舒适和温暖舒适,但他们可以快速报告凉爽舒适,这表明失重下的人体可能对凉爽环境更敏感。最后是相应的舒适气温( 根据MTCV的判别结果,t a ) 模拟失重范围估计为26℃ ≤  t a < 30℃。

更新日期:2021-06-21
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