Document Detail

Effects of ambient light on body temperature regulation in resting and exercising rats.
MedLine Citation:
PMID:  10869805     Owner:  NLM     Status:  MEDLINE    
We investigated the effects of environmental light and darkness on thermoregulation during both daytime and nighttime by monitoring body temperature (T(b)) and physical activity of rats using a telemetry system. Experiments were performed in both resting and exercising rats. In resting rats, lights-off during the daytime resulted in an increase in both T(b) and activity. Conversely, during the nighttime, T(b) decreased with the lights-on stimulus despite the fact that the activity was left unchanged. Treadmill exercise (10 m/min) always increased T(b) from the basal resting level. In both daytime and nighttime, exercising rats exhibited a persistent T(b)-rise when lights were on. However, in the lights-off condition at nighttime, the T(b) of exercising rats increased to a level significantly higher than that of exercising rats with the lights-on. Our results suggest that light at nighttime causes the suppression of T(b) in both resting and exercising rats.
H Hasegawa; T Yazawa; H Tanaka; M Yasumatsu; M Otokawa; Y Aihara
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Neuroscience letters     Volume:  288     ISSN:  0304-3940     ISO Abbreviation:  Neurosci. Lett.     Publication Date:  2000 Jul 
Date Detail:
Created Date:  2000-08-24     Completed Date:  2000-08-24     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  7600130     Medline TA:  Neurosci Lett     Country:  IRELAND    
Other Details:
Languages:  eng     Pagination:  17-20     Citation Subset:  IM    
Department of Biology, Tokyo Metropolitan University, Japan.
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MeSH Terms
Body Temperature Regulation / physiology*
Circadian Rhythm / physiology
Conditioning (Psychology) / physiology
Locomotion / physiology
Photic Stimulation
Physical Exertion / physiology*
Rats, Wistar
Rest / physiology*

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