Lee Stuart M C, Guined Jamie R, Brown Angela K, Stenger Michael B, Platts Steven H
Wyle Integrated Science and Engineering Group, Houston, TX 77058, USA.
Aviat Space Environ Med. 2011 Jun;82(6):648-53. doi: 10.3357/asem.3039.2011.
Astronauts have worn an inflatable antigravity suit (AGS) during Space Shuttle re-entry and landing to protect against hypotension and syncope, but ambulation with an inflated AGS requires significant effort and may prevent successful completion of an unaided emergency egress from the vehicle. NASA is considering the use of alternative garments to provide protection against post-spaceflight orthostatic intolerance. The purpose of this study was to compare the metabolic cost of walking in NASA's current AGS with that of walking in a commercially available elastic compression garment (thigh-high stockings), a candidate garment for use after exploration missions.
There were 10 volunteers (5 men, 5 women) who walked on a treadmill at 5.6 km x h(-1) for 5 min, a simulation of unaided egress previously used in our laboratory, in 3 different conditions presented in random order: wearing exercise clothes, wearing elastic compression garments, and wearing the AGS. Oxygen consumption (Vo2), carbon dioxide production (Vco2), and ventilation (V(E)) were compared using repeated-measures ANOVA and Tukey's Honestly Significant Difference test.
Vo2 while wearing the AGS was 12% greater than when wearing the elastic compression garments and 15% greater than while wearing exercise clothes. There were no differences between the elastic compression garments and exercise clothes only conditions. Vco2 and VE also were greater while walking in the AGS than walking in the elastic compression garments or exercise clothes.
Wearing elastic compression garments as a countermeasure to post-spaceflight orthostatic intolerance may not impair unaided egress from a space vehicle.
宇航员在航天飞机重返大气层和着陆期间穿着充气式抗荷服（AGS），以防止低血压和晕厥，但穿着充气的抗荷服行走需要付出巨大努力，且可能妨碍从航天器成功完成独立应急撤离。美国国家航空航天局（NASA）正在考虑使用替代服装来预防太空飞行后出现的直立不耐受。本研究的目的是比较在NASA当前的抗荷服中行走与在一种市售弹性压缩服装（大腿长袜）中行走的代谢成本，该弹性压缩服装是探索任务后使用的候选服装。
有10名志愿者（5名男性，5名女性），他们以5.6 km×h⁻¹的速度在跑步机上行走5分钟，这是之前在我们实验室中使用的独立应急撤离模拟，在3种不同条件下随机进行：穿着运动服、穿着弹性压缩服装以及穿着抗荷服。使用重复测量方差分析和Tukey真实显著差异检验比较耗氧量（Vo₂）、二氧化碳产生量（Vco₂）和通气量（V(E)）。
穿着抗荷服时的Vo₂比穿着弹性压缩服装时高12%，比穿着运动服时高15%。仅穿着弹性压缩服装和运动服这两种条件之间没有差异。在穿着抗荷服行走时的Vco₂和VE也高于穿着弹性压缩服装或运动服行走时。
穿着弹性压缩服装作为预防太空飞行后直立不耐受的对策可能不会妨碍从航天器进行独立应急撤离。
