Complexity of human postural control in subjects with unilateral peripheral vestibular hypofunction

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Title:	Complexity of human postural control in subjects with unilateral peripheral vestibular hypofunction
Authors:	羅孟宗;Yeh, Jia-Rong;Lo, Men-Tzung;Chang, Fu-Ling;Hsu, Li-Chi
Contributors:	生醫理工學院生醫科學與工程學系
Keywords:	Adult;Age Factors;Aged;Aging - physiology;Biomechanical Phenomena;Center of pressure;Complexity;Dizziness - physiopathology;Entropy;Female;Humans;Male;Middle Aged;Multiscale entropy;Neurotology - methods;Orthopedics;Postural Balance - physiology;Pressure;Sensory organization test;Taiwan;Unilateral vestibular dysfunction
Date:	2014-01-01
Issue Date:	2026-04-23 11:15:24 (UTC+8)
Publisher:	Elsevier;England: Elsevier B.V
Abstract:	摘要： •Nonlinear complexity analysis (complexity index, CI) can be a new assessment tool of postural control mechanism.•CI of AP-direction COP time series is significantly correlated with aging.•Test conditions of SOT drive the changes of complexity in COP time series. Complexity is a new measure for identifying the adaptability of a complex system to meet possible challenges. For a center of pressure (COP) time series, the complexity measure represents the stability of postural control. In this study, multiscale entropy (MSE) was used to evaluate the complexity of COP time series in six test conditions of sensory organization test (SOT). Complexity index (CI) is defined as the summation of entropies with coarse-graining scales 1–20 by MSE. A total of 51 subjects belonging to 3 groups – healthy-young, healthy-elderly and dizzy – were recruited in this study. The COP signals in both anteroposterior (AP) and mediolateral (ML) directions were analyzed respectively. According to our results, the CI of AP-direction COP time series is significantly correlated to the equilibrium score, which represents the stability of postural control in SOT. The AP-direction sway is significant larger than the ML-direction sway, particularly in the test conditions with sway-surface. In additions, the CI of AP-direction COP for the healthy-elderly and dizzy groups are significantly lower than those for the healthy young group in the test conditions 1–4. The CI of ML-direction COP for the healthy-elderly group is significantly lower than those for the healthy-young and dizzy groups under test conditions 3 and 6. These results show that the complexity loss is a common status of AP-direction COP time series for both healthy-elderly and dizzy groups, and the complexity of ML-direction COP time series for subjects with unilateral vestibular dysfunction is higher than that for the healthy-elderly group specifically under test conditions 3 and 6. 其他題名： Gait Posture 出版者： England: Elsevier B.V 出版日期： 2014-09-01 出處： Gait & posture, 2014-09, Vol.40 (4), p.581-586 版權： 2014 Elsevier B.V. 版權： Elsevier B.V. 版權： Copyright © 2014 Elsevier B.V. All rights reserved. 識別號： ISSN: 0966-6362 識別號： ISSN: 1879-2219 識別號： EISSN: 1879-2219 識別號： DOI: 10.1016/j.gaitpost.2014.06.016 識別號： PMID: 25047829
Appears in Collections:	[Department of Biomedical Sciences and Engineering ] journal & Dissertation

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