ORTHOSTATIC RESPONSES IN HEAT TOLERANT AND INTOLERANT SUBJECTS COMPARED BY 3 DIFFERENT METHODS

  • 1 January 1980
    • journal article
    • research article
    • Vol. 51  (11) , 1205-1208
Abstract
Orthostatic responses of 10 heat tolerant and 5 intolerant [human] subjects were evaluated by 3 different test methods-standing, head-up tilt (HUT) and head-up tilt after prolonged exercise (HUTPE)-in a hot environment of 40.degree. C, 40% RH [relative humidity]. No difference was found within the normal group between responses in standing and HUT test. In HUTPE test, orthostatic responses were inadequate and 5 of 10 subjects fainted. Heat intolerant subjects reacted to all 3 tests similarly to normal group, though their heart rate was higher and 3 out of 5 fainted at an earlier phase in HUTPE test.

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