Document Detail

Rambling and trembling in quiet standing.
MedLine Citation:
PMID:  11500575     Owner:  NLM     Status:  MEDLINE    
The goal of this study was to explore the rambling-trembling decomposition in quiet standing. The center of pressure (COP) and the horizontal ground reaction force (F(hor)) were registered in healthy subjects standing in an upright bipedal posture on a force platform. The COP positions at the instants when F(hor) = 0 were identified (instant equilibrium points, IEP) for the anterior-posterior direction, then the COP time series, were partitioned into its components using 2 different techniques, rambling-trembling decomposition and gravity line decomposition. The two decomposition techniques provided very similar results. An unexpectedly large correlation between the trembling trajectory and the difference between COP and gravity line was found, r = 0.91 (range, 0.83 < r < 0.98). The correlation implies that the GL moves from an IEP to the subsequent IEP along a smooth trajectory that can be predicted by the spline approximation. A substantial negative cross-correlation at a zero time lag was observed between the trembling and the F(hor), -0.90 < r < -0.75. For the rambling trajectory, the coefficients of correlation with F(hor) were low, -0.33 < r < -0.05. The data support the hypothesis that during quiet standing the body sways for two reasons: the migration of the reference point (rambling) and the deviation away from that point (trembling).
V M Zatsiorsky; M Duarte
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Motor control     Volume:  4     ISSN:  1087-1640     ISO Abbreviation:  Motor Control     Publication Date:  2000 Apr 
Date Detail:
Created Date:  2001-08-13     Completed Date:  2001-08-30     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9706297     Medline TA:  Motor Control     Country:  United States    
Other Details:
Languages:  eng     Pagination:  185-200     Citation Subset:  IM    
Biomechanics Laboratory, Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA.
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MeSH Terms
Biophysical Phenomena
Postural Balance*
Signal Processing, Computer-Assisted

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

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