Document Detail

Exercise does not necessarily influence the phase of the circadian rhythm in temperature in healthy humans.
MedLine Citation:
PMID:  12200924     Owner:  NLM     Status:  MEDLINE    
Seventeen healthy adults exercised for 30 min (70% VO2max), at different times of the day and night throughout a 24 h period. The effect on the phase of core temperature rhythm was assessed by comparing the rhythms on the day immediately before and immediately after the day of exercise with the participants living normally on these 2 days. Assessments were made upon data that had been corrected for the thermogenic effects of sleep and activity. When exercise was performed in the period between 4 h before and 1 h after the temperature minimum, there was a phase delay of 1.03 +/- 0.78 h (mean +/- s; n = 6); when performed between 3 and 8 h after the temperature minimum, there was a phase advance of 1.07 +/- 1.23 h (n = 9). Both means were significantly different from zero (Student's one-sample t-tests: P < 0.05). Performed at other times, exercise had no significant effect on the phase of the temperature rhythm. The phase changes were not significantly different from those previously observed by us in sedentary individuals exposed to domestic lighting. We conclude that the amount of physical activity has very little effect on the body clock.
B Edwards; J Waterhouse; G Atkinson; T Reilly
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of sports sciences     Volume:  20     ISSN:  0264-0414     ISO Abbreviation:  J Sports Sci     Publication Date:  2002 Sep 
Date Detail:
Created Date:  2002-08-30     Completed Date:  2003-01-16     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8405364     Medline TA:  J Sports Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  725-32     Citation Subset:  IM    
Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Trueman Building, Henry Cotton Campus, 15-21 Webster Street, Liverpool L3 2ET, UK.
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MeSH Terms
Activities of Daily Living
Body Temperature / physiology*
Body Temperature Regulation
Circadian Rhythm / physiology*
Exercise / physiology*
Time Factors

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