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J Appl Physiol 45: 626-629, 1978;
8750-7587/78 $5.00
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Journal of Applied Physiology, Vol 45, Issue 4 626-629, Copyright © 1978 by American Physiological Society

ARTICLES

Relaxed +GZ tolerance in healthy men: effect of age

D. H. Hull, R. A. Wolthuis, K. K. Gillingham and J. H. Triebwasser

Fifty-three healthy US Air Force aircrewmen, 26-55 yr old, volunteered for a centrifuge study designed to determine the effect of age on relaxed +GZ tolerance. Each was subjected to G forces of gradual and rapid onset, with G tolerance determined by standardized contraction of peripheral visual fields. Of the subject characteristics studied, only age was positively correlated with rapid-onset G tolerance; both age and weight were positively correlated with gradual-onset G tolerance. A combination of age and weight gave a stronger positive correlation with G tolerance (rapid- and gradual-onset) than did either characteristic alone. No significant negative correlations were observed. We conclude that aging may offer some protection from G stress; there is no evidence that aging leads to a decrement in G tolerance.




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