Document Detail


Priming of the sweat glands explains reflex sweating in the heat.
MedLine Citation:
PMID:  22235781     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The purpose of this study was to determine whether reflex sweating during isometric handgrip exercise (IHG) in the heat was due to a priming effect in the sweat glands or an increase in skin temperature. Ten male subjects completed four trials where they performed IHG for three minutes at 40% of their maximal voluntary contraction (MVC). The four trials included: (1) a control trial in thermoneutral conditions (23 ± 1(o)C), (2) after sitting in hyperthermic conditions (35 ± 1(o)C) for 30 min, (3) a local heating trial after having their non-exercising arm wrapped in a heat pad that maintained forearm skin temperature at ∼35(o)C for 30 min, 4) and after pilocarpine iontophoresis to a 5 cm(2) area of the forearm. The sweating rate (SR), as measured by resistance hygrometry, was not significantly different (P > 0.05) from baseline during IHG in either the control or local heating trial, but was significantly increased (P < 0.05) from baseline during the hyperthermic and pilocarpine trials. Baseline SR values of the hyperthermic and pilocarpine trials (∼0.25 mg/cm(2)/min) were significantly greater than the control and local heating trials (∼0.05 mg/cm(2)/min). These results suggest that reflex sweating in the heat during IHG is primarily due to a priming effect in the sweat glands and not because of an increase in skin temperature.
Authors:
Steven Avila; Michael J Buono
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  International journal of hyperthermia : the official journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group     Volume:  28     ISSN:  1464-5157     ISO Abbreviation:  Int J Hyperthermia     Publication Date:  2012  
Date Detail:
Created Date:  2012-01-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8508395     Medline TA:  Int J Hyperthermia     Country:  England    
Other Details:
Languages:  eng     Pagination:  19-23     Citation Subset:  IM    
Affiliation:
Department of Biology.
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