Document Detail

Circadian variation in skin blood flow responses to passive heat stress.
MedLine Citation:
PMID:  9402607     Owner:  NLM     Status:  MEDLINE    
To examine whether there is a circadian variation in skin blood flow response to passive heat stress and maximal skin blood flow, which was measured by local warming to 42 degrees C for 45 min, we studied six men at an ambient temperature of 28 degrees C at four different times of day [0400-0700 (morning), 1000-1300 (daytime), 1600-1900 (evening), and 2200-0100 hours (night)], each time of day being examined on separate days. Heat stress at rest was performed by immersing the legs below the knee in hot water (42 degrees C) for 60 min. The esophageal temperature (Tes) at rest was significantly higher in the evening than in the morning. The maximal skin blood flow (SkBFmax) on both sites, back and forearm, did not show a significant difference among the four times of day. The variation in Tes thresholds for cutaneous vasodilation to heat stress was similar to the circadian rhythm in resting Tes. The relationship of the percentage of SkBFmax (%SkBF) with Tes was significantly lower in the morning than in the evening. The results suggest that the maximal skin blood flow during local warming does not show variation over the day, but the sensitivity of vasodilation to passive heat stress shows a circadian variation.
K Aoki; N Kondo; M Shibasaki; S Takano; T Katsuura
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Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  Physiology & behavior     Volume:  63     ISSN:  0031-9384     ISO Abbreviation:  Physiol. Behav.     Publication Date:  1997 Dec 
Date Detail:
Created Date:  1998-02-04     Completed Date:  1998-02-04     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0151504     Medline TA:  Physiol Behav     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1-5     Citation Subset:  IM    
Division of Design Science, Graduate School of Science and Technology, Chiba University, Japan.
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MeSH Terms
Blood Pressure / physiology
Body Temperature Regulation / physiology
Circadian Rhythm / physiology*
Esophagus / innervation,  physiology
Heat Stress Disorders / physiopathology*
Laser-Doppler Flowmetry
Regional Blood Flow
Skin / blood supply*,  physiopathology
Vasodilation / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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