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Human thermoregulation: separating thermal and nonthermal effects on heat loss
Glen P Kenny1,W Shane Journeay1
1
Human and Environmental Physiology Research Unit, Laboratory for Human Bioenergetics and Environmental Physiology, School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada, K1N 6N5. gkenny@uottawa.ca
DOI: 10.2741/3620 Volume 15 Issue 1, pp.259-290
Published: 01 January 2010
(This article belongs to the Special Issue Frontiers in thermoregulation research)
Abstract

Human thermoregulatory control during heat stress has been studied at rest, during exercise and more recently during exercise recovery. Heat balance in the body is maintained by changes in the rate of heat loss via adjustments in skin blood flow and sweating. Independent of thermal control, the actions of nonthermal factors have important consequences in the control of heat loss responses during and following exercise. While the effect of these nonthermal factors is largely considered to be an inhibitory or excitatory stimulus which displaces the set-point about which temperature is regulated, their effects on human thermoregulatory control are far reaching. Many factors can affect the relative contribution of thermal and nonthermal influences to heat balance including exercise intensity, hemodynamic status, and the level of hyperthermia imposed. This review will characterize the physiological responses associated with heat stress and discuss the thermal and nonthermal influences on sweating and skin blood flow in humans. Further, recent calorimetric evidence for the understanding of thermal and nonthermal contributions to human heat balance will also be discussed.

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Glen P Kenny, W Shane Journeay. Human thermoregulation: separating thermal and nonthermal effects on heat loss. Frontiers in Bioscience-Landmark. 2010. 15(1); 259-290.