Document Detail


Infants born preterm exhibit different patterns of center-of-pressure movement than infants born at full term.
MedLine Citation:
PMID:  19815647     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Infants born preterm are at risk for developmental impairments related to postural control. OBJECTIVE: The purpose of this study was to determine whether infants born preterm and infants born at full term differed in postural control at 1 to 3 weeks after term age. DESIGN: This study included 17 infants born preterm (mean gestational age=31.9 weeks, range=25.0-34.6) and 15 infants born at full term (mean gestational age=38.9 weeks, range=37.3-40.6). All infants were without diagnosed neurological or genetic conditions. MEASUREMENT: Center-of-pressure (COP) data were recorded at 5 Hz while each infant was positioned supine on a pressure-sensitive mat in an alert behavioral state. Root mean square (RMS) displacement and approximate entropy (ApEn) were used to describe the COP movement variability in the time series. Differences between groups were identified using independent t tests. RESULTS: The COP time series were found to be deterministic, suggesting order in the time series. Infants born preterm exhibited significantly larger RMS values in the caudal-cephalic direction than infants born at full term (1.11 and 0.83 cm, respectively; t=-2.6, df=30, P=.01). However, infants born at full term had significantly larger ApEn values in the caudal-cephalic direction (1.19 and 1.11, respectively; t=2.4, df=30, P=.02). The 2 groups did not differ in RMS or ApEn values in the medial-lateral direction or the resultant. CONCLUSIONS: Infants born at full term exhibited COP displacements in the caudal-cephalic direction that were smaller in amplitude, but may be considered more complex or less predictable, than those of infants born preterm. One explanation is that infants born preterm exhibited more stereotypic patterns of movement, resulting in large, but repetitive, COP excursions. A combination of linear and nonlinear measures may provide insight into the control of posture of young infants.
Authors:
Stacey C Dusing; Anastasia Kyvelidou; Vicki S Mercer; Nick Stergiou
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2009-10-08
Journal Detail:
Title:  Physical therapy     Volume:  89     ISSN:  1538-6724     ISO Abbreviation:  Phys Ther     Publication Date:  2009 Dec 
Date Detail:
Created Date:  2009-12-04     Completed Date:  2010-01-18     Revised Date:  2010-09-28    
Medline Journal Info:
Nlm Unique ID:  0022623     Medline TA:  Phys Ther     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1354-62     Citation Subset:  AIM; IM    
Affiliation:
Department of Physical Therapy, Virginia Commonwealth University, Richmond, VA 23298, USA. scdusing@vcu.edu
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MeSH Terms
Descriptor/Qualifier:
Female
Humans
Infant, Newborn
Infant, Premature / physiology*
Male
Movement / physiology*
Postural Balance / physiology*
Supine Position / physiology
Term Birth / physiology
Grant Support
ID/Acronym/Agency:
1K12HD055931-01/HD/NICHD NIH HHS; H133G040118//PHS HHS; H133G080023//PHS HHS; K25HD047194/HD/NICHD NIH HHS
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