Document Detail

Light of domestic intensity produces phase shifts of the circadian oscillator in humans.
MedLine Citation:
PMID:  9605494     Owner:  NLM     Status:  MEDLINE    
Twelve subjects have been studied in a chamber that isolated them from external noise and lighting. After several control days, one group (n = 6) was subjected to 18 x 27-h 'days' and the other to 11 x 30-h 'days'. Sleep was in the dark, and awake times were spent in normal domestic lighting (150-500 lux). Rectal temperature and wrist actimetry were measured throughout, and the phase of the circadian oscillator was inferred from that of the temperature data, purified to remove direct effects of activity. During the experimental 'days' the rhythms showed a mean period of 24.4 h. A detailed examination of the phase shifts from one day to the next showed that small advances and delays were superimposed upon this drift. Moreover, the mean size and direction of these shifts depended upon the time of exposure to lighting relative to the temperature minimum, as would be predicted from a phase-response curve.
J Waterhouse; D Minors; S Folkard; D Owens; G Atkinson; I Macdonald; T Reilly; N Sytnik; P Tucker
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Neuroscience letters     Volume:  245     ISSN:  0304-3940     ISO Abbreviation:  Neurosci. Lett.     Publication Date:  1998 Apr 
Date Detail:
Created Date:  1999-01-07     Completed Date:  1999-01-07     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7600130     Medline TA:  Neurosci Lett     Country:  IRELAND    
Other Details:
Languages:  eng     Pagination:  97-100     Citation Subset:  IM    
School of Human Sciences, Liverpool John Moores University, UK.
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MeSH Terms
Body Temperature
Circadian Rhythm / physiology*
Environment, Controlled
Linear Models
Sleep / physiology
Wakefulness / physiology

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