EVALUATION OF ALTERNATIVE METHODS FOR INCREASING TOLERANCE TO +Gz ACCELERATION. PHASE 2

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Authors
  1. MacDougall, J.D.
Corporate Authors
McMaster Univ, Hamilton ONT (CAN) Dept of Physical Education;McMaster Univ, Hamilton ONT (CAN) Dept of Medicine;Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
Unconsciousness can occur during exposure to sustained, headward radial acceleration (G) due to hypotension at head level, and, methods of improving G tolerance of pilots of high performance aircraft are required. The aim of these experiments at 1 G was to determine an alternate protocol for forceful leg contractions that could assist the standard anti-G straining maneuver to increase blood pressure. Using an exercise of hip and knee extension in the sitting position, it was found that: (i) isometric, muscular contractions were more effective at increasing mean arterial blood pressure than concentric or eccentric contractions; (ii) the relative intensity of the isometric contraction determined the magnitude of the blood pressure increase throughout a knee joint angle range of 75 to 105 degrees; (iii) simultaneous, double leg contractions produced greater blood pressure increases than alternating, single leg contractions. TRUNCATED
Date of publication
15 Dec 1989
Number of Pages
28
DSTKIM No
90-01760
CANDIS No
64027
Format(s):
Hardcopy;Originator's fiche received by DSIS;Document Image stored on Optical Disk

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