【摘要】 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 1 8～ 2 1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 (1 )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 1 5min ;(2 )被试者口前区O2 和CO2 分压在头盔面窗关闭 5～ 7min后都可出现一个平衡状态 ,并持续到实验结束 ;(3 )在 8～ 1 0min的平衡时间内 ,口前区O2 分压在 1 5.0～1 6 .4kPa范围内 ,处于轻度缺氧状态 ;CO2 分压在 5.2 1～ 6 .49kPa的范围内 ,处于生理可耐受的时间-浓度曲线范围 ;(4)被试者在实验用密闭服中所测试的各项生理指标在调节阀开关置于A和B两种状态时没有显著性差异。结论被试者在清醒静卧及大气压为 1atm的条件下 ,密闭服防窒息时间至少可达 1 5min。更多还原

【Abstract】 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 CO 2 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.更多还原