Variability and stability analysis of walking of transfemoral amputees

被引:124
作者
Lamoth, Claudine C. [1 ]
Ainsworth, Erik [2 ]
Polomski, Wojtek [3 ]
Houdijk, Han [2 ,3 ]
机构
[1] Univ Groningen, Univ Med Ctr Groningen, Ctr Human Movement Sci, NL-9713 AV Groningen, Netherlands
[2] Vrije Univ Amsterdam, Fac Human Movement Sci, Res Inst MOVE, Amsterdam, Netherlands
[3] Heliomare Rehabil Ctr, Wijk Aan Zee, Netherlands
关键词
Gait variability; Gait stability; Stochastic dynamics; Trunk acceleration patterns; Prosthetic walkers; LOCAL DYNAMIC STABILITY; TIME-SERIES; KINEMATIC VARIABILITY; TRUNK ACCELEROMETRY; FRACTAL DYNAMICS; ENTROPY ANALYSIS; BALANCE CONTROL; BODY MOTION; GAIT RHYTHM; EXPONENTS;
D O I
10.1016/j.medengphy.2010.07.001
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
Variability and stability of walking of eight transfemoral amputees and eight healthy controls was studied under four conditions walking inside on a smooth terrain walking while performing a dual-task and walking outside on (ir)regular surfaces Trunk accelerations were recorded with a tri-axial accelerometer Walking speed mean and coefficient of variation of stride times (ST) and the root mean squares (RMS) of trunk accelerations was calculated Gait variability and stability were quantified using measures derived from the theory of stochastic dynamics Regularity was indexed using the sample entropy (SEn) and the scaling exponent alpha derived form Detrended Fluctuations Analysis Local stability (LSE) quantified gait stability Walking speed was lower but ST variability was not different for amputees than controls RMS of medio-lateral accelerations was higher for amputees SEn was higher implying less predictable accelerations and LSE higher indicating decreased stability The largest condition effect was present for walking outside trunk RMS increased and LSE decreased Differences in walking between amputees and healthy controls and their responses to perturbations revealed themselves in the magnitude variability and stability measures of trunk accelerations These results Imply that quantifying the dynamical structure of trunk accelerations can differentiate between groups with different walking abilities and between conditions of increasing difficulty and may therefore provide a useful diagnostic tool (C) 2010 IPEM Published by Elsevier Ltd All rights reserved
引用
收藏
页码:1009 / 1014
页数:6
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