Document Detail

Postural coordination modes and transition: dynamical explanations.
MedLine Citation:
PMID:  17256166     Owner:  NLM     Status:  MEDLINE    
While research to date has been successful in quantifying postural behaviour, this paper examines the causes of transition between postural coordination mode using dynamical variables and, by inference, efficient control strategies underlying postural behaviour. To this end, six subjects in bipedal stance were instructed to maintain a constant distance between their head and a visual target that oscillated along the line of sight. Within sessions, participants were exposed to gradual changes in increasing target motion frequency. Kinematic results showed a sudden transition between in-phase and anti-phase postural coordination modes in visual target tracking. The dynamical analysis pointed out that (1) the center of pressure (CoP) position parameter is a crucial parameter in the determination of the adopted coordination mode, (2) the change occurred in response to limits bordered by the system: the interaction between equilibrium constraints (A/P displacements of CoP), physiological limits (net joint moments) support the emergence of different postural behaviours and, (3) finally, the anti-phase mode presents a better distribution of muscular moment between hip and ankle joints and is more effective to achieve high frequency oscillations with limited CoP displacements.
Myriam Ferry; Violaine Cahouët; Luc Martin
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Publication Detail:
Type:  Journal Article     Date:  2007-01-26
Journal Detail:
Title:  Experimental brain research     Volume:  180     ISSN:  0014-4819     ISO Abbreviation:  Exp Brain Res     Publication Date:  2007 Jun 
Date Detail:
Created Date:  2007-06-04     Completed Date:  2007-10-12     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  49-57     Citation Subset:  IM    
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MeSH Terms
Ankle / innervation
Hip / innervation
Models, Biological*
Motion Perception / physiology*
Movement / physiology*
Nonlinear Dynamics*
Psychomotor Performance / physiology*
Task Performance and Analysis

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