The Effect of Head and Body Position on +Gz Acceleration Tolerance
Abstract
It has been suggested there is a relationship between acceleration- induced loss of consciousness (G-LOC) and head/body 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; 6G/s 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 G/s onset-rate runs (no G-suit inflation; relaxed) to a maximum of +9 Gz and 0.5 G/s 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 (22/1914) and check-6 (32/1914) positions. During the prospective study with AGSM runs, there was no significant difference in the time at maximum G among any of the positions.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1994
- Accession Number
- ADA282257
Entities
People
- Andrew Tong
- James T. Webb
- Lloyd Tripp
- Ronald C. Hill
Organizations
- Armstrong Laboratory