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Circadian rhythm in sweating and cutaneous blood flow

and Public Health, Lou over the course of the day. To verify this concept, we studied those responses at six different times during the 24-h day in conditions similar to those of the previous study . METHODS thermoregul sensor ation; forearm blood flow; dew point temperature OCTU RNAL LOWERING of internal body tempe rature has been correlated with a lowering of the interna .l temL perature threshold for cutaneous vasodilation and sweating during exercise (27). The circadian rhythm in internil body temperature thus appears to be regulated, rather than just the consequence of passive imbalances in rates of’ heat production and heat loss. Wenger et al. (27) hvpothesized that the circadian rhyth m in the control of h&t dissipation operated through a reference common to both v,asomotor and sudomotor control. However, that research examined the forearm blood flow and sweating response to an internal heat load at only two different times of day: afternoon and early morning. We hoped to describe further the thermoregulatory mechanism responsible for the circadian rhythm of resting core temperature. If the circadian rhythm in internal temperature is mainly t,he result of’ an active rhythm in the brain’s t hermoregulatory center, thresholds for heat-dissipative http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png AJP - Regulatory, Integrative and Comparative Physiology The American Physiological Society

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