Dixon G A, Adams J D, Harvey W T
Aviat Space Environ Med. 1986 Mar;57(3):223-8.
The purpose of this study was to determine the minimum spacesuit pressure required to prevent decompression sickness (DCS) during operational conditions in a 50% oxygen/50% nitrogen environment. In this study, 30 male volunteer subjects were exposed in groups of three, to three consecutive daily extravehicular activity (EVA) simulations at 7.8 psia (5,031 m altitude equivalent) for a continuous period of 6 h. During each altitude exposure, the subjects participated in similar exercise workloads expected to be experienced by astronauts during a typical EVA scenario. Precordial Doppler monitoring revealed that 73.3% of the subjects had intravenous bubbling during at least 1 d of the 3 d of exposure, with 26.7% remaining bubble-free during the entire study. No correlation was found between either body fat or age and incidence of bubble formation. One case of DCS occurred during the study indicating that 7.8 psia is not sufficient pressure to totally preclude DCS in a 50% oxygen/50% nitrogen environment. The necessary pressure awaits further study.
本研究的目的是确定在50%氧气/50%氮气环境下的操作条件期间，预防减压病（DCS）所需的最小航天服压力。在本研究中，30名男性志愿者受试者被分成三人一组，在7.8 psia（相当于5031米海拔高度）下连续3天每天进行6小时的连续舱外活动（EVA）模拟。在每次海拔暴露期间，受试者参与了预计宇航员在典型EVA场景中会经历的类似运动负荷。心前区多普勒监测显示，73.3%的受试者在3天暴露中的至少1天出现静脉气泡，26.7%的受试者在整个研究期间无气泡。未发现体脂或年龄与气泡形成发生率之间存在相关性。研究期间发生了1例DCS，表明7.8 psia的压力不足以在50%氧气/50%氮气环境中完全预防DCS。所需压力有待进一步研究。
