【摘要】 体液分布改变和体液丧失 ,血浆量减少 ,血管收缩和舒张调节能力改变 ,运动能力降低等是影响微重力状态下人体热调节的主要因素。头低位卧床模拟微重力时也产生类似变化。卧床后热应激时 ,人体的核心温度升高加快 ,皮肤温度升高和组织热导率增加速率降低 ,核心与皮肤间的传热减小 ,出汗敏感性增高。可见 ,微重力和卧床模拟微重力暴露后人体热应激的热调节能力降低。比较分析表明 :利用卧床模型进行微重力条件下人体热调节模拟研究是适宜的。更多还原

【Abstract】 Comparisons of headward fluid shifts, plasma volume losses, altered vasodilator and vasoconstrictor responses, reduced exercise capacities,etc.between microgravity and head down tilt (HDT) bedrest suggested that HDT model was suitable for simulating thermoregulation under microgravity. Both microgravity and simulated microgravity by HDT exposures degraded human thermoregulation ability in some aspects. The features of the responses to heat stress on men after HDT exposures were higher increase rate in rectal temperature, attenuated increase rates of skin temperature and body heat conductance, less heat dissipation from core to skin and higher sensitivity of sweating etc.更多还原