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Title of Journal: Eur J Appl Physiol

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Abbravation: European Journal of Applied Physiology

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Springer-Verlag

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10.1007/978-3-642-34321-6_12

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1439-6327

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Nonthermal modification of heatloss responses du

Authors: Narihiko Kondo Takeshi Nishiyasu Yoshimitsu Inoue Shunsaku Koga
Publish Date: 2010/05/30
Volume: 110, Issue: 3, Pages: 447-458
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Abstract

This review focuses on the characteristics of heatloss responses during exercise with respect to nonthermal factors In addition the effects of physical training on nonthermal heatloss responses are discussed When a subject is already sweating the sweating rate increases at the onset of dynamic exercise without changes in core temperature while cutaneous vascular conductance skin blood flow is temporarily decreased Although exercise per se does not affect the threshold for the onset of sweating it is possible that an increase in exercise intensity induces a higher sensitivity of the sweating response Exercise increases the threshold for cutaneous vasodilation and at higher exercise intensities the sensitivity of the skinbloodflow response decreases Facilitation of the sweating response with increased exercise intensity may be due to central command peripheral reflexes in the exercising muscle and mental stimuli whereas the attenuation of skinbloodflow responses with decreased cutaneous vasodilation is related to many nonthermal factors Most nonthermal factors have negative effects on magnitude of cutaneous vasodilation however several of these factors have positive effects on the sweating response Moreover thermal and nonthermal factors interact in controlling heatloss responses with nonthermal factors having a greater impact until core temperature elevations become significant after which core temperature primarily would control heat loss Finally as with thermally induced sweating responses physical training seems to also affect sweating responses governed by nonthermal factorsWe thank all of the volunteers who participated in this research and the researchers who give us important concepts for investigating the control of heatloss responses during exercise This study was partly supported by the Ministry of Education Science Sports and Culture GrantinAid for Scientific Research B grant no 19300221 This review is expanded based on the earlier reviews Kondo 1999 Kondo 2005 with adding new results and papers

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