Document Detail

Two steps forward and one back: Learning to walk affects infants' sitting posture.
MedLine Citation:
PMID:  17292776     Owner:  NLM     Status:  MEDLINE    
The transition from sitting to walking is a major motor milestone for the developing postural system. This study examined whether this transition to walking impacts the previously established posture (i.e., sitting). Nine infants were examined monthly from sitting onset until 9 months post-walking. Infants sat on a saddle-shape chair either independently or with their right hand touching a stationary contact surface. Postural sway was measured by sway amplitude, variability, area, and velocity of the center of pressure trajectory. The results showed that for all the postural measures in the no-touch condition, a peak before or at walk onset was observed in all the infants. At the transition age, when peak sway occurred, infants' postural sway measures were significantly greater than at any other age. Further, infants' postural sway was attenuated by touch only at this transition. We suggest that this transient disruption in sitting posture results from a process involving re-calibration of an internal model for the sensorimotor control of posture so as to accommodate the newly emerging bipedal behavior of independent walking.
Li-Chiou Chen; Jason S Metcalfe; John J Jeka; Jane E Clark
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2006-08-22
Journal Detail:
Title:  Infant behavior & development     Volume:  30     ISSN:  1934-8800     ISO Abbreviation:  Infant Behav Dev     Publication Date:  2007 Feb 
Date Detail:
Created Date:  2007-02-12     Completed Date:  2007-02-22     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  7806016     Medline TA:  Infant Behav Dev     Country:  United States    
Other Details:
Languages:  eng     Pagination:  16-25     Citation Subset:  IM    
Department of Kinesiology, University of Maryland, College Park, MD 20742-2611, USA.
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MeSH Terms
Child Development*
Longitudinal Studies
Motor Skills
Postural Balance / physiology*
Walking / physiology*

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