基于最大摩擦因数的下肢肌无力者滑跌步态特性分析

Analysis of Slips and Falls Gaits Characteristics of Lower Extremities’ Myasthenia Based on RCOF

针对老年人行走过程滑跌现象的频繁发生,提出了利用改进的所需最大摩擦因数及COM(center of mass)波动值来分析滑跌过程的方法.该方法以基于Kane方程的仿生下肢行走动力学模型为基础,能够实现行走过程动力学参数值的快速检测,能对行走过程的任一瞬时平衡状态进行分析,并据此判断和验证滑动和跌倒过程的临界值,建立了老年人滑跌步态的理论基础.通过肌力正常与肌无力老年人的行走步态实验数据比较,下肢肌力不足的老年人,因其神经肌肉控制力下降,步态姿势趋于不稳定,发生滑倒的概率更高.步态分析实验数据表明,该方法能够对滑跌过程进行准确描述.

To investigate the frequent slips and falls in older adults of myasthenic lower extremities,a method was proposed that could analyze the process of slips and falls with the modified peak of required coefficient of friction（RCOF）and the amplitude of the center of mass（COM）.This method,based on the Kane’s equations dynamic model of the lower extremities,can be used to rapidly detect dynamic parameters in each gait cycle,and analyze every instantaneous balance status during walking.According to the resultst,he critical point thresholds of slips and falls have been judged and verified and the theoretical groundwork for slips and falls’ gaits in older adults of myasthenic lower extremities has been established.By comparing the walking experimental data between no myasthenia and myasthenic older people,myasthenic older people’s gaits became more and more unstable because of the declined quality of neuromuscular control.For its,lips and falls more easily occur on myasthenia older people.The experimental data show that the method can well and effectively describe the process of slips and falls.