Physiologic correlates of protection afforded by anti-G suits.
A new uniform-pressure pneumatic anti-G suit (UPS) was compared with the standard CSU-13B/P anti-G suit, using measurements of: blood lactate, heart rate changes, and segmented lower-body blood pooling (by impedance plethysmography). Subjects were exposed to a series of gradual-onset-rate (GOR) runs (0.1 G.s-1), rapid-onset-rate (ROR) runs (6 G.s-1), and simulated aerial combat maneuvers (SACM) on the USAF School of Aerospace Medicine human-use centrifuge. All measured parameters and subjective reports indicated that increased protection was afforded by the UPS. The impedance plethysmography measurements indicated that prevention of blood pooling in all lower-body segments is the predominant mechanism whereby uniform pressure permits significantly longer times-to-fatigue during SACMs.
Krutz
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KRUG International, Technology Services Division, San Antonio, TX.
Burton
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Forster
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D000328:Adult; D001143:Arousal / Q000502:physiology*; D001810:Blood Volume / Q000502:physiology; D005221:Fatigue / Q000503:physiopathology*; D006112:Gravitation; D005676:Gravity Suits; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D007773:Lactates / Q000097:blood; D019344:Lactic Acid; D007866:Leg / Q000098:blood supply; D008297:Male; D010992:Plethysmography, Impedance
D007773:Lactates; D019344:Lactic Acid