Document Detail

Ecological measurements of light exposure, activity, and circadian disruption.
MedLine Citation:
PMID:  23504497     Owner:  NLM     Status:  Publisher    
Circadian rhythms are biological rhythms that repeat at approximately 24 hours. In humans, circadian rhythms have an average period of 24.2 hours. The 24-hour patterns of light and dark on the retina synchronize circadian rhythms to the local time on earth. Lighting characteristics affecting circadian rhythms are very different than those affecting visual responses. Lack of synchronization between the endogenous clock and the local time has been associated with a host of maladies. Therefore, it is important to measure circadian light exposures over the course of the 24-hour day and to be able to assess circadian entrainment and disruption in actual living environments. Presented is an overview of the recently developed Daysimeter, a personal measurement device for recording activity and circadian light-exposure. When the Daysimeter is worn on the head, two light sensors near the eye are used to estimate circadian light (CLA) exposures over extended periods of time. Phasor analysis combines the measured periodic activity-rest patterns with the measured periodic light-dark patterns to assess behavioural circadian entrainment/disruption. As shown, day-shift and rotating-shift nurses exhibit remarkably different levels of behavioural circadian entrainment/disruption. These new ecological measurement and analysis techniques may provide important insights into the relationship between circadian disruption and well-being.
D Miller; A Bierman; Mg Figueiro; Es Schernhammer; Ms Rea
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2010-6-8
Journal Detail:
Title:  Lighting research & technology (London, England : 2001)     Volume:  42     ISSN:  1477-1535     ISO Abbreviation:  Light Res Technol     Publication Date:  2010 Sep 
Date Detail:
Created Date:  2013-3-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101582548     Medline TA:  Light Res Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  271-284     Citation Subset:  -    
Lighting Research Center, Rensselaer Polytechnic Institute, 21 Union Street, Troy, NY 12180 USA.
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MeSH Terms
Grant Support
U01 DA023822-01/DA/NIDA NIH HHS

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