Summary
Sweating is a heat loss response that is critical for improved physical performance and safety in extremely hot conditions. It is centrally regulated by the preoptic area and anterior hypothalamus and peripherally transmitted by sympathetic sudomotor innervation, with acetylcholine (ACh) as the primary neuroglandular transmitter. Modification of sweating activity through heat exposure or physical training is a physiological tactic for improved tolerance when individuals are challenged with exogenous or endogenous heat. A short-term heat challenge produces a lower resting and slower increase in body temperature as well as enhanced sweating response, while long-term heat exposure results in decreased sweat output. Cold acclimation results in reduced thermoneutral and skin temperatures, lowered cold sensation, and reduced metabolic heat production. Physical training induces higher sweat output by means of greater sweat output per activated sweat gland, a shorter lag phase for sweating, an increased number of activated sweat glands, and a higher rate of skin blood flow.
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Kosaka, M. et al. (2001). Central and Peripheral Control of Sweating Mechanisms: Modifications by Thermal Acclimatization and Physical Training. In: Kosaka, M., Sugahara, T., Schmidt, K.L., Simon, E. (eds) Thermotherapy for Neoplasia, Inflammation, and Pain. Springer, Tokyo. https://doi.org/10.1007/978-4-431-67035-3_11
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