人体在不通风密闭服中的生理调节

目的 研究实验用密闭服在不通风条件下对人体生理机能的影响及其防窒息的作用。方法 ５名年龄为１８～２１岁的健康男性分别在密闭服调节阀开关被置于Ａ和Ｂ两种不同位置的密闭服中进行测试。结果 ⑴在清醒静卧，外界大气压为１ａｔｍ的条件下，被试者在面窗关闭且调节阀与外界相通的密闭服中，耐受时间至少可达１５ｍｉｎ；⑵被试者口前区Ｏ２和ＣＯ２分压在头盔面窗关闭５～７ｍｉｎ后者可出现一个平衡状态，并持续到实验结束；

Human Physiological Regulation in the Closed Suit with no Ventilation.

Objective. To study the effects of the Experimental Closed Suit (ECS) with no active ventilation on human physiological functions and its anti-asphyxic role. Method. Five young healthy male subjects, aged 18-21 years, were tested in the ECS with no active ventilation and no oxygen supply (NAVANOS) when the gas regulatory valve switch was placed on A or B position respectively. Result. (1) Under 1 atm air pressure, each subject could endure at least 15 min while they were aware and resting in the ECS with NAVANOS; (2) There was a balancing period or plateau of the oxygen and the carbon dioxide pressure in the vicinity of the mouth in 5 to 7 min after the sealed helmet was closed, and this period lasted to the end of each test; (3) During the 8-10 min balancing period, the oxygen partial pressure in the vicinity of the mouth ranged from 15.0 to 16.4 kpa, which was slightly hypoxic, and the range of the carbon dioxide partial pressure was 5.21 to 6.49 kPa, which was within the CO2 concentration-time curve of human physiological endurance; (4) No significant difference in human physiological parameters was found when the regulatory valve was placed on A or B position. Conclusion. The anti-asphyxic time of ECS with NAVANOS could at least last 15 min under 1 atm air pressure while the subjects were aware and resting.