Document Detail


Rest-activity patterns of premature infants are regulated by cycled lighting.
MedLine Citation:
PMID:  15060235     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVES: Many hospitalized premature infants are exposed to continuous dim lighting rather than to cycled lighting. However, we do not know whether dim lighting or low-intensity cycled lighting is more conducive to the development of rest-activity patterns that are in phase with the solar light-dark cycle. Thus, we examined the effects of nursery lighting conditions on the development of activity patterns in premature infants. METHODS: Premature infants who were born at <32 weeks' postmenstrual age and were medically stable in neonatal intensive care unit rooms were randomly assigned between 32 and 34 weeks' postmenstrual age to either continuous dim lighting (<25 lux; duration 24 days; control group; n = 29) or cycled lighting (239 +/- 29 lux, 7:00 AM to 7:00 PM; <25 lux, 7:00 PM to 7:00 AM; duration: 25 days; experimental group; n = 33). Activity was continuously monitored from enrollment until approximately 1 month after discharge from the hospital. Weight and head circumference were also assessed up to 6 months after discharge from the hospital. RESULTS: Over the first 10 days at home, distinct day-night differences in activity were not seen in control subjects (D day-night: N 1.07 +/- 0.02), but experimental group infants were more active during the day than at night (day-night: 1.25 +/- 0.03). It was not until 21 to 30 days after discharge that day-night activity ratios in control infants matched those seen in experimental group infants shortly after discharge, yet even at this age, experimental group infants (day-night: 2.13 +/- 0.19) were considerably more active during the day than at night as compared with control subjects (day-night: 1.43 +/- 0.09). CONCLUSION: Exposure of premature infants to low-intensity cycled lighting in the hospital nursery induces distinct patterns of rest-activity that are apparent within 1 week after discharge. In comparison, the appearance of distinct patterns of rest and activity are delayed in infants who are exposed to continuous dim lighting in the hospital. These observations show that day-night rhythms in activity patterns can be detected shortly after discharge to home in premature infants and that the circadian clock of developing infants is entrained by cycled lighting.
Authors:
Scott A Rivkees; Linda Mayes; Harris Jacobs; Ian Gross
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Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Pediatrics     Volume:  113     ISSN:  1098-4275     ISO Abbreviation:  Pediatrics     Publication Date:  2004 Apr 
Date Detail:
Created Date:  2004-04-02     Completed Date:  2004-05-13     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0376422     Medline TA:  Pediatrics     Country:  United States    
Other Details:
Languages:  eng     Pagination:  833-9     Citation Subset:  AIM; IM    
Affiliation:
Department of Pediatrics, Yale University School of Medicine, New Haven, Connecticut 06520-8081, USA. Scott.Rivkees@yale.edu
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MeSH Terms
Descriptor/Qualifier:
Activity Cycles
Circadian Rhythm*
Humans
Infant, Newborn
Infant, Premature
Intensive Care Units, Neonatal
Lighting*
Multivariate Analysis
Sleep
Grant Support
ID/Acronym/Agency:
K02-DA00222/DA/NIDA NIH HHS; P01-HD03008/HD/NICHD NIH HHS; R01 NS32624/NS/NINDS NIH HHS; R01-DA-06025/DA/NIDA NIH HHS; RR06022/RR/NCRR NIH HHS

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


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