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  • Heat stress reduces a person's ability to achieve maximal metabolic rates during exercise.

  • Heat stress increases the total metabolic rate and anaerobic participation during submaximal exercise, and these increases are somewhat abated by heat acclimatization.

  • Exercise-heat stress reduces hepatic blood flow and increases hepatic glucose release.

  • Individuals routinely have sweating rates of 1 liter per hour when working in hot environments.

  • Dehydration from sweat loss increases plasma tonicity and decreases blood volume, both of which reduce heat loss and result in elevated core temperature levels during exercise-heat stress.

  • During exercise-heat stress, competing metabolic and thermoregulatory demands for blood flow make it difficult to maintain an adequate cardiac output.


Adolph, E.F., and associates 1947 Physiology of Man in the Desert. New York: Interscience Publishers.

Armstrong, L.E., and K.B. Pandolf 1988 Physical training, cardiorespiratory physical fitness and exercise-heat tolerance. Pp. 199–226 in Human Performance Physiology and Environmental Medicine at Terrestrial Extremes, K.B. Pandolf, M.N. Sawka, and R.R. Gonzalez , eds. Indianapolis, Ind.: Benchmark Press.

Armstrong, L.E., R.W. Hubbard, B.H. Jones, and J.T. Daniels 1986 Preparing Alberto Salazar for the heat of the 1984 Olympic Marathon. Physician Sportsmed. 14(3):73–81.

Åstrand, I. 1960 Aerobic work capacity in men and women. Acta Physiol. Scand. 49(suppl. 169):64–73.

Brouha, L., P.E. Smith, Jr., R. De Lanne, and M.E. Maxfield 1960 Physiological reactions of men and women during muscular activity and recovery in various environments. J. Appl. Physiol. 16:133–140.

Burch, G.E., and N.P. DePasquale 1962 Hot Climates, Man and His Heart. Springfield, Ill.: Charles C. Thomas.

Cleland, T.S., S.M. Horvath, and M. Phillips 1969 Acclimatization of women to heat after training. Int. Z. Angew. Physiol. 27:15–24.

Consolazio, C.F., R. Shapiro, J.E. Masterson, and P.S.L. McKinzie 1961 Energy requirements of men in extreme heat. J. Nutr. 73:126–134.

Consolazio, C.F., L.O. Matoush, R.A. Nelson, J.A. Torres, and G.J. Isaac 1963 Environmental temperature and energy expenditures. J. Appl. Physiol. 18:65–68.

Dill, D.B., H.T. Edwards, P.S. Bauer, and E.J. Levenson 1930/1931 Physical performance in relation to external temperature. Arbeitsphysiologie 3:508–518.

Dimri, G.P., M.S. Malhotra, J. Sen Gupta, T.S. Kumar, and B.S. Aora 1980 Alterations in aerobic-anaerobic proportions of metabolism during work in heat. Eur. J. Appl. Physiol. 45:43–50.

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