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A Comparison of Linear and Nonlinear Stability Parameters in Different Clinical Forms of Multiple Sclerosis Publisher



Anbarian M1 ; Marviesfahani M2 ; Karimi MT3 ; Etemadifar M4 ; Marandi SM5 ; Kamali M3
Authors
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Authors Affiliations
  1. 1. Bu Ali Sina University, Hamedan, Iran
  2. 2. Department of Physical Education and Sport Science, Najafabad Branch, Islamic Azad University, Najafabad, Isfahan, Iran
  3. 3. Department of Orthotics and Prosthetics, Musculoskeletal Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
  4. 4. Department of Neurology, Isfahan University of Medical Sciences, Isfahan, Iran
  5. 5. Department of Sport Physiology, University of Isfahan, Isfahan, Iran

Source: European Review of Aging and Physical Activity Published:2015


Abstract

Background: Multiple sclerosis (MS) is one of the neurological diseases that affect the ability of subjects to stand and walk. The stability of MS subjects has been evaluated in various studies, mostly based on linear approach. Based on this approach it is controversial weather stability of MS subjects differ from normal or not. Therefore, the aim of this study was to evaluate stability in three groups of MS subjects (spastic, ataxic and ataxic-spastic) using both linear and non-linear approaches. Method: Seventeen healthy and 36 subjects with MS participated in this study. The MS group presenting with spastic, ataxic and ataxic-spastic (each group consisted of 12 subjects) participated in the study. The stability of the subjects was evaluated using Kistler force plate. The difference between stability of the subjects was evaluated using the Multi Analysis of Variance and significant value was set at P < 0.05. Result: There was a significant difference in the mean value of Approximate Entropy (ApEn) in anterior-posterior direction between normal (0.66 ± 0.13) and ataxic (0.85 ± 0.12) and ataxic-spastic (0.90 ± 0.12) subjects (P < 0.05) and no difference between normal and spastic groups (0.76 ± 0.13). The results of both linear and nonlinear approaches confirmed that both ataxic and ataxic-spastic subjects had more instability than normal subjects. Although, the mean values of stability parameters increased in spastic compared to normal, the difference was not statistically significant. Conclusion: Subjects with ataxic and ataxic-spastic MS disorder had difficulty in controlling their stability during quiet standing. The results of this study also confirmed that spasticity of muscles surrounding the hip and knee joints did not influence standing stability in patients with spastic MS. © 2015 Anbarian et al.
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