Document Detail

Nonlinear analysis of the development of sitting postural control.
MedLine Citation:
PMID:  12672087     Owner:  NLM     Status:  MEDLINE    
The development of sitting postural control in five normal infants was examined longitudinally at three stages of sitting: Stage 1, when infants could hold up their head and upper trunk, but could not sit independently; Stage 2, when infants began to sit independently briefly; and Stage 3, when infants could sit independently. Methods from nonlinear dynamics were used to analyze center of pressure (COP) data during sitting in terms of stability of the neuromuscular system (Lyapunov Exponent), movement dimensionality (Correlation Dimension), and complexity/regularity (Approximate Entropy). Results indicated significant changes in the nonlinear measures over time, with increased stability and increased regularity revealing a more stable and periodic strategy of maintaining postural control. Dimensionality decreased from Stage 1 to 2, indicating a constraint of the degrees of freedom. Subsequently, dimensionality increased from Stage 2 to 3, indicating a release of the degrees of freedom as sitting independence emerged. Nonlinear analysis of the COP time series supports the perspective that the development of postural control is a dynamic process whereby the infant learns to control the body's degrees of freedom to achieve the sitting posture.
Regina T Harbourne; Nicholas Stergiou
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Developmental psychobiology     Volume:  42     ISSN:  0012-1630     ISO Abbreviation:  Dev Psychobiol     Publication Date:  2003 May 
Date Detail:
Created Date:  2003-04-02     Completed Date:  2003-09-09     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0164074     Medline TA:  Dev Psychobiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  368-77     Citation Subset:  IM    
Copyright Information:
Copyright 2003 Wiley Periodicals, Inc. Dev Psychobiol 42: 368-377, 2003.
Munroe-Meyer Institute, University of Nebraska Medical Center, Omaha, NE 68198-5450, USA.
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MeSH Terms
Child Development*
Nonlinear Dynamics*
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