Document Detail

Sweating responses during activation of the muscle metaboreflex in humans is altered by time of day.
MedLine Citation:
PMID:  14706114     Owner:  NLM     Status:  MEDLINE    
AIM: The aim of the present study was to test for a time-of-day effect on sweating responses to activation of the muscle metaboreflex. METHODS: Eight male subjects each participated in two exercise sessions, one in the morning and one in the evening. Within each session there were two 60-s bouts of isometric handgrip (IHG) exercise at 50% maximal voluntary contraction. Prior to IHG, whole body warming by a water-perfused suit initiated mild sweating. The first bout of IHG exercise began at 06.00 hours (am) and 18.00 hours (pm). Blood circulation to the forearm was occluded for 120 s, beginning 5 s before the end of the second bout of IHG to activate the muscle metaboreflex. RESULTS: During both bouts of exercise, sweating rate (SR) on both the chest and right forearm significantly increased from the pre-exercise period in both am and pm sessions. SR rapidly decreased during first minute of recovery after the first bout of IHG exercise. However, during post-exercise ischaemia (PEI) after the second bout of IHG exercise, SR was maintained significantly above the pre-exercise level only in the pm session. The increases in SR on the chest and right forearm during PEI were significantly greater in the pm, than in the am, session. However, SR of the palm was not maintained during PEI. CONCLUSIONS: We conclude that under mild hyperthermic conditions, the sweating response in non-glabrous skin to activation of the muscle metaboreflex exhibits a time-of-day effect.
K Aoki; N Kondo; Y Shimomura; M Yokoi; K Iwanaga; H Harada; T Katsuura
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Acta physiologica Scandinavica     Volume:  180     ISSN:  0001-6772     ISO Abbreviation:  Acta Physiol. Scand.     Publication Date:  2004 Jan 
Date Detail:
Created Date:  2004-01-06     Completed Date:  2004-05-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370362     Medline TA:  Acta Physiol Scand     Country:  England    
Other Details:
Languages:  eng     Pagination:  63-70     Citation Subset:  IM    
Department of Kinesiology, Graduate School of Science, Tokyo Metropolitan University, Tokyo, Japan.
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MeSH Terms
Blood Pressure / physiology
Body Temperature
Circadian Rhythm / physiology*
Exercise / physiology
Forearm / physiology
Heart Rate / physiology
Isometric Contraction / physiology
Muscle, Skeletal / blood supply,  physiology*
Reflex / physiology
Regional Blood Flow
Sweating / physiology*

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