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Heat stress reponses related to the menstrual cycle

PHYSIOLOGY Vol. 35, No. 1, July 1973. Printed in U.S.A. Heat stress reponses the menstrual cycle related CHRISTINE L. WELLS AND STEVEN M. HORVATH Institute of Environmental Stress, University of California, Santa Barbara, California c WELLS,~HRISTINE L., AND STEVEN M. HORVATH. Heat stress re- sponses related to the menstrual cycb. J. Appl. Physiol. 35(l) : l-5. 1973.-Seven young adult female subjects were exposed to an environment of 48’ C, 11 mm water vapor pressure, for 2 hr at each of three distinct menstrual phases. Cyclic changes in basal body temperature associated with ovulation were accompanied by significantly higher hemoglobin and hematocrit values during the ovulatory phase. Serum electrolyte (Na+, Kf, and Cl-) concentrations showed little relation to menstrual phase. There was a tendency toward higher heart rates and lower ventilation volumes during ovulatory phase heat exposures. No significant differences in core (rectal) or peripheral (skin) temperatures, oxygen consumption, or total body sweating rates occurred during phases of the menstrual cycle. Luteal phase sweating and evaporative rates tended to lag behind mean values obtained during the other two menstrual phases, but values were essentially equal by 40 min of heat exposure. Hemoglobin, hematocrit, plasma protein, and lactate values declined http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Physiology The American Physiological Society

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