中文摘要：

针对失重条件下人体出汗所发生的变化，采用航天医学领域的-6°头低位卧床（HDBR）实验与常规热舒适实验相结合的方法，在12种空气温湿度下对6名男性受试者进行不同部位皮肤微电流的实验测量，将皮肤微电流作为人体出汗的指示信号．研究结果表明：HDBR模拟失重时，空气相对湿度较低的条件下（RH=30％）人体皮肤出汗比HDBR卧床前需要更高的空气温度刺激，并且出汗率相比卧床前出现一定程度的降低；中等湿度（45％）条件下，模拟失重时的皮肤出汗率随着空气温度增高而增加，但是显著低于HDBR卧床前的水平；高湿条件（80%）下且环境温度高于29℃时，模拟失重时人体皮肤出汗率显著增高，其值低于HDBR卧床前的水平但与其差值逐渐减小．此外，在实验环境下所有受试者的皮肤出汗敏感度降低，并且大腿、小腿、上臂皮肤出汗率显著低于额头、胸和背部皮肤处的出汗率．研究证明，模拟失重条件下人体皮肤出汗与正常重力时存在不同的变化，研究结果可为载人航天时人体热环境的改善提供依据．

英文摘要：

In order to study the changes of human sweating under simulated weightlessness, the -6° Head-Down Bed Rest （HDBR） experiment usually employed in the researches of Space Medicine and the traditional experiment of human thermal comfort were carried out.During the experiment, micro current of skin,which was presumed as an indicator of human sweating,was measured on 6 male subjects under different air temperatures and relative humidity.The results showed that higher air temperature was required under lower air humidity for sweating after HDBR, and the sweat rate was found to be lower than that before HDBR.In addition, the sweat rate,indicated by skin micro current, increased with the air temperatures under neutral air humidity, but it was significantly less than that before HDBR.Furthermore, the sweat rate of the subjects after HDBR was found to increase rapidly when the air temperature was higher than 29℃ under high air humidity （80%）, and its value was approaching that before HDBR. Moreover, attenuated sensitivity of sweating was observed among the subjects during HDBR,and the sweat rate at the forehead, thorax and back was more significant than those at the lower body and forearm.The results suggest that the human sweating under simulated weightlessness is different from that under terrestrial condition,which can provide evidences for the improvements of the thermal environment during the manned spaceflight.