Document Detail


Posturographic measures in healthy young adults during quiet sitting in comparison with quiet standing.
MedLine Citation:
PMID:  19884033     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Measures of postural steadiness - known as posturography - are commonly used for balance assessment during quiet standing. Although quiet sitting balance may be studied via posturography as well, this has not been done to date. As such, the purpose of this study was to characterize the posturography during quiet sitting in comparison with quiet standing and to provide a benchmark for future studies investigating differences in balance regulation and execution. Twelve young and healthy people agreed to quietly sit and stand on a force platform with their eyes open and closed. For each condition, one trial of 2 min was executed and the anterior-posterior, medial-lateral, and resultant distance fluctuations of the body's center of pressure (COP) were calculated. Finally, time-domain, frequency-domain, and stabilogram diffusion function (SDF) measures were identified and compared for all COP time series. The results consistently indicate that, for quiet sitting, the body sway size and velocity were smaller and the power-weighted average frequency larger than for quiet standing. Moreover, the SDF analysis revealed that quiet sitting shows fewer drifts over short time intervals, but also fewer controlled adjustments in the longer term to bring the system back to equilibrium. The observed differences can be partially explained by biomechanical and dynamic differences of the body portions that are in motion during quiet sitting and standing. The SDF analysis suggests, however, that also the balance control strategies are not identical. These findings may be especially useful for the assessment of sitting balance and the development of novel balance rehabilitation techniques and assistive devices.
Authors:
Albert H Vette; Kei Masani; Vivian Sin; Milos R Popovic
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-11-01
Journal Detail:
Title:  Medical engineering & physics     Volume:  32     ISSN:  1873-4030     ISO Abbreviation:  Med Eng Phys     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2010-02-03     Completed Date:  2010-04-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9422753     Medline TA:  Med Eng Phys     Country:  England    
Other Details:
Languages:  eng     Pagination:  32-8     Citation Subset:  IM    
Copyright Information:
(c) 2009 IPEM. Published by Elsevier Ltd. All rights reserved.
Affiliation:
Institute of Biomaterials and Biomedical Engineering, University of Toronto, 164 College Street, Toronto, Ontario M5S 3G9, Canada. a.vette@utoronto.ca
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MeSH Terms
Descriptor/Qualifier:
Adult
Biomechanics
Diffusion
Female
Humans
Male
Movement / physiology
Postural Balance*
Posture*
Proprioception / physiology
Psychomotor Performance
Stochastic Processes
Time Factors
Young Adult
Grant Support
ID/Acronym/Agency:
129179//Canadian Institutes of Health Research

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


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