Document Detail

Effects of head extension on undisturbed upright stance control in humans.
MedLine Citation:
PMID:  15760748     Owner:  NLM     Status:  MEDLINE    
The purpose of the present experiment was to investigate whether and how the head extended posture, commonly encountered in many routine activities, affects undisturbed upright stance control mechanisms in humans. Sixteen young healthy adults stood feet together, with their eyes closed and were asked to sway as little as possible in two Neutral and Extended head conditions. Centre of pressure (CP) displacements, recorded using a force platform, were used to compute the motions of the vertical projection of the centre of gravity (CG(v)) and those of the difference CP - CG(v). A time-domain analysis shows increased mean velocity and surface covered by the trajectory of both elementary motions in the Extended head condition. A frequency analysis also reveals increased root mean squares on the CP - CG(v) motions, suggesting increased muscular activity in the Extended head condition. Furthermore, similar changes occur on CG(v) motions. Finally, modelling these trajectories as a fractional Brownian motion process demonstrates increased spatial transition point co-ordinates at which the corrective process is initiated and a more deterministic control mechanism in this corrective process involving CG(v) motions in the Extended head position. Together, the present findings suggest that head extension position yields a reorganisation of the control mechanisms for maintaining undisturbed upright stance.
Nicolas Vuillerme; Patrice Rougier
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Gait & posture     Volume:  21     ISSN:  0966-6362     ISO Abbreviation:  Gait Posture     Publication Date:  2005 Apr 
Date Detail:
Created Date:  2005-03-11     Completed Date:  2005-07-14     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9416830     Medline TA:  Gait Posture     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  318-25     Citation Subset:  IM    
Laboratoire de Modélisation des Activités Sportives, Université de Savoie, Domaine Universitaire, 73376 Le Bourget du Lac cedex, France.
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MeSH Terms
Head Movements / physiology*
Postural Balance / physiology*
Posture / physiology
Signal Processing, Computer-Assisted
Statistics, Nonparametric

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

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