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Critical temperature of unacclimatized male Caucasians

JAMES Institute cclimatized E. WILKERSON, PETER B. RAVE , STEVEN of Environmental Stress, University of Cal$ornia, Santa Barbara, M. HORVATH Calfornia 93106 WILKER~~N, HORVATH. JAMES E., PETER B. RAVEN, STEVEN MI. Cr2hd ttw@?ruture of unacdimatz&d mah Caucasians. J. Appl. Physiol. 33(4) : 451-455. 1972 .---Five unacclimatized male Caucasians were each exposed to ambient temperatures of 28, 25, 20, Go C, relative humidity 50 A 2oj,, air movement < 4 m/min. A significant increase (P < 0.01) in the steady-state resting metabolic rate above that measured at 28” C was observed at each successively lower ambient temperature. The steady-state resting mean skin temperature decreased significantly (P < 0.01) the mean steady-state resting rectal temperature increased significantly (P < 0.02) with decreasing ambient temperature. The lower critical temperature as determined by the intercept method was about 25.2” C with a range of 21.7-27.1” C. From these data the average whole-body heat transfer coefficient was found to assume a constant value at all ambient temperatures. ‘She reasons for the determination of similar lower critical temperatures by exercise resting techniques were discussed it was suggested that difrerences in the lower critical temperature of various ethnic groups would not be found. lower critical http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Physiology The American Physiological Society

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