Document Detail

Generalizability of Stabilogram Diffusion Analysis of center of pressure measures.
MedLine Citation:
PMID:  17482466     Owner:  NLM     Status:  MEDLINE    
Quiet standing balance and postural control are often assessed by drawing information from center of pressure (COP) data collected with a force platform. Efforts to better understand the underlying processes involved in postural control have lead to methods that examine the dynamic or stochastic characteristics of the COP. One method that has recently gained popularity is Stabilogram Diffusion Analysis (SDA). There is, however, a lack of standardization in the methodology of data collection for this approach, i.e., how many trials to include and how long to sample a trial. The purpose of this study was to use the tools of Generalizability Theory (G-Theory) to investigate the reliability of SDA measures of quiet standing and to establish an optimal measurement protocol. G-Theory provides a tool that allows us to break down the sources of variation, or facets, in a measurement procedure and ultimately design a protocol that provides optimal reliability. Fifteen young, healthy participants completed ten 90-s trials: first with eyes open and then eyes closed. Common measures of SDA were calculated using the first 30, 60 and 90 s of each trial. G-Theory through a Generalizability Study (G-study) and follow-up Decision Studies (D-studies) were performed to estimate reliability coefficients (G-coefficients). The fully crossed facets included were participants (P), length of trials (L) and number of trials (T). Results of this study suggest that at least five 60s trials should be used when using the selected measures of SDA. These guidelines address acceptable reliability and the gains achieved by adding trials or increasing trial length.
Richard J Doyle; Brian G Ragan; Karthikeyan Rajendran; Karl S Rosengren; Elizabeth T Hsiao-Wecksler
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Publication Detail:
Type:  Journal Article     Date:  2007-05-04
Journal Detail:
Title:  Gait & posture     Volume:  27     ISSN:  0966-6362     ISO Abbreviation:  Gait Posture     Publication Date:  2008 Feb 
Date Detail:
Created Date:  2008-01-15     Completed Date:  2008-04-10     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9416830     Medline TA:  Gait Posture     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  223-30     Citation Subset:  IM    
Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, USA.
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MeSH Terms
Models, Statistical*
Postural Balance / physiology*
Posture / physiology*

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

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