Webb J T, Olson R M, Krutz R W, Dixon G, Barnicott P T
Technology Services Division, KRUG International, San Antonio, Texas.
Aviat Space Environ Med. 1989 May;60(5):415-21.
Extravehicular activity (EVA) currently involves decompression to 4.3 psia. This degree of decompression carries a significant potential for decompression sickness (DCS) which could be alleviated if a pressure of 9.5 psia could be maintained in the pressure suit. Previous studies have not evaluated the potential for oxygen toxicity at 9.5 psia. Twenty-one subjects were exposed to 100% oxygen at 9.5 psia for 5 consecutive days, 8 h.d-1 while performing moderate exercise to simulate a typical work-week in the proposed pressure suit environment. No DCS or venous gas bubbles were detected. Pulmonary function tests, physical exams, blood analyses, arterial oxygen saturation monitoring, and X-rays showed no evidence of oxygen toxicity under these conditions. These results suggest that a 100% oxygen, 9.5 psia pressure suit environment could avoid both DCS and oxygen toxicity during EVAs of comparable duration and physical activity.
目前，舱外活动（EVA）需要减压至4.3磅力/平方英寸绝对压力（psia）。这种减压程度存在显著的减压病（DCS）风险，如果能在压力服中维持9.5 psia的压力，这种风险可能会得到缓解。以往的研究尚未评估9.5 psia时氧中毒的可能性。21名受试者在9.5 psia的压力下连续5天每天暴露于100%氧气中，持续8小时，同时进行适度运动，以模拟在拟议的压力服环境中的典型工作周。未检测到减压病或静脉气泡。肺功能测试、体格检查、血液分析、动脉血氧饱和度监测和X光检查均未显示在这些条件下存在氧中毒迹象。这些结果表明，在持续时间和体力活动相当的舱外活动期间，100%氧气、9.5 psia的压力服环境可以避免减压病和氧中毒。
