The Effect of Head and Body Position on +Gz Acceleration Tolerance
Interim rept. 1 Oct 1992-10 Aug 1993
ARMSTRONG LAB BROOKS AFB TX
Pagination or Media Count:
It has been suggested there is a relationship between acceleration- induced loss of consciousness G-LOC and headbody position. A two-part investigation was conducted to determine whether head and body position affects acceleration tolerance. A retrospective analysis of high-G training data N 1, 914 compared G-LOC occurrence during straight-ahead exposure to a check-6 exposure 10 s at 9 Gz 6Gs onset rate G-suit inflated anti-G straining maneuver AGSM performed. A prospective study N 12 was conducted with acceleration exposures using light loss criteria with subjects in straight- ahead, above, over-the-right shoulder, or over-the-left shoulder positions. Profiles consisted of 0.1 Gs onset-rate runs no G-suit inflation relaxed to a maximum of 9 Gz and 0.5 Gs onset-rate runs G-suit inflated AGSM performed to 9 Gz for up to 26 s. In the retrospective study, no significant difference existed between G-LOC occurrence during straight-ahead 221914 and check-6 321914 positions. During the prospective study with AGSM runs, there was no significant difference in the time at maximum G among any of the positions.
- Medicine and Medical Research
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