Zhang H, Peng Y K, Xu G L, Yang F
Institute of Space Medico-Engineering, Beijing, China.
Space Med Med Eng (Beijing). 2000 Oct;13(5):332-5.
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.
目的。研究无主动通风的实验性密闭服（ECS）对人体生理功能的影响及其抗窒息作用。方法。选取5名年龄在18 - 21岁的健康年轻男性受试者，分别在气体调节阀开关置于A或B位置时，于无主动通风且无氧气供应的ECS（NAVANOS）中进行测试。结果。（1）在1个大气压的空气压力下，每名受试者在NAVANOS的ECS中清醒并休息时至少能耐受15分钟；（2）封闭头盔关闭后5至7分钟内，口腔附近的氧气和二氧化碳压力有一个平衡期或平台期，且该时期持续到每次测试结束；（3）在8 - 10分钟的平衡期内，口腔附近的氧分压范围为15.0至16.4千帕，略呈低氧状态，二氧化碳分压范围为5.21至6.49千帕，处于人体生理耐受的二氧化碳浓度 - 时间曲线范围内；（4）调节阀置于A或B位置时，人体生理参数无显著差异。结论。在1个大气压的空气压力下，NAVANOS的ECS的抗窒息时间在受试者清醒并休息时至少可持续15分钟。
