EVALUATION OF ALTERNATIVE METHODS FOR INCREASING TOLERANCE TO +Gz ACCELERATION: PHASE 3

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Authors
  1. MacDougall, J.D.
Corporate Authors
McMaster Univ, Hamilton ONT (CAN) Dept of Physical Education;Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN);McMaster Univ, Hamilton ONT (CAN) Dept of Medicine
Abstract
The objective of this contract was to evaluate various aspects of human exposure to +Gz and to evaluate the effectiveness of components of the anti-G straining maneuver by direct measurements of arterial blood pressure. The findings were: (i) for measuring blood pressure, indwelling pressure-tip transducers are preferable to external fluid-filled columns; (ii) eye level blood pressure decreased according to the equation: P decrease mmHg = 0.855 x vertical distance between eye and aortic root in cm X Gz; (iii) isometric leg contractions with less than 1 sec relaxation phases are no more effective in increasing blood pressure than uninterrupted contractions; (iv) as long as effort remains maximal, blood pressure response from maximum leg contraction over 45 sec is unaffected by force reductions due to fatigue. TRUNCATED
Date of publication
15 Jun 1991
Number of Pages
50
DSTKIM No
92-00139
CANDIS No
103040
Format(s):
Hardcopy;Originator's fiche received by DSIS;Document Image stored on Optical Disk

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