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Test-Retest Reliability of Linear and Nonlinear Measures of Postural Stability During Visual Deprivation in Healthy Subjects Publisher



Ghofrani M1 ; Olyaei G1 ; Talebian S1 ; Bagheri H1 ; Malmir K1
Authors
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Authors Affiliations
  1. 1. Physical Therapy Department, School of Rehabilitation, Tehran University of Medical Sciences and Health Services, Piche Shemiran, Enghelab Street, PO Box 1148965141, Tehran, Iran

Source: Journal of Physical Therapy Science Published:2017


Abstract

[Purpose] The purpose of this study is to evaluate the reliability of linear and nonlinear measures of the center of pressure (COP) during visual deprivation. [Subjects and Methods] Fifteen young adults participated in this study. COP signals were recorded in two conditions: eyes open and eyes closed. Three trials were performed in each condition with a rest period of approximately 1 min. The intraclass correlation coefficients (ICCs) and standard error of measurement (SEM) were calculated. [Results] The investigation of ICC and SEM between trials showed that the Lyapunov exponent (ICC: 0.76–0.96, SEM: 0.03) and total mean velocity (ICC: 0.71–0.95, SEM: 0.05) were more reliable and repeatable than range and area (95% confidence ellipse), while area had the least reliability (ICC: 0.49–0.77, SEM: 0.56). [Conclusion] The Lyapunov exponent can be considered an appropriate postural control index, and the evaluation of postural stability should be done by considering linear and nonlinear tools. © 2017 The Society of Physical Therapy Science. Published by IPEC Inc.
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