Document Detail

Biological rhythm development in preterm infants: does health status influence body temperature circadian rhythm?
MedLine Citation:
PMID:  11526616     Owner:  NLM     Status:  MEDLINE    
Twenty-six preterm infants, postconceptional age from 28 to 35 weeks and postnatal age approximately 14 days, were included in a study of the development of temperature circadian rhythm. Insulated abdominal skin temperature and incubator air temperature were recorded continuously at 1-min intervals for 24 hr. Using cosinor analysis, cycle mesor, amplitude, and acrophase were determined. Initial results from regression analysis did not confirm a predicted linear relationship between postconceptional age and amplitude; however, dividing the sample according to health status into sick (N = 15) and not sick (N = 11) groups revealed differing regression models. For not sick infants, amplitude increased with postconceptional age (R(2) =.405), whereas no relationship was found between postconceptional age and cycle amplitude in sick infants (R(2) =.069). These results indicate that healthy preterm infants demonstrate emergence of circadian temperature rhythm. Implications include potential time-based periods of vulnerability, overheating and hyperthermia, and management of incubator operation.
K A Thomas
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Research in nursing & health     Volume:  24     ISSN:  0160-6891     ISO Abbreviation:  Res Nurs Health     Publication Date:  2001 Jun 
Date Detail:
Created Date:  2001-08-29     Completed Date:  2001-09-13     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  7806136     Medline TA:  Res Nurs Health     Country:  United States    
Other Details:
Languages:  eng     Pagination:  170-80     Citation Subset:  IM; N    
Copyright Information:
Copyright 2001 John Wiley & Sons, Inc.
University of Washington, Box 357262, Seattle, 98195-7262, USA.
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MeSH Terms
Body Temperature / physiology*
Circadian Rhythm / physiology*
Health Status*
Incubators, Infant
Infant, Newborn
Infant, Premature / physiology*
Linear Models
Multivariate Analysis
Skin Temperature
Grant Support

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

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