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首页> 外文期刊>Biomedical Engineering: Applications, Basis and Communications >MYOELECTRIC ACTIVATION DIFFERENCES IN TRANSFEMORAL AMPUTEES DURING LOCOMOTOR STATE TRANSITIONS
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MYOELECTRIC ACTIVATION DIFFERENCES IN TRANSFEMORAL AMPUTEES DURING LOCOMOTOR STATE TRANSITIONS

机译:机车状态转换过程中跨臂安瓿中的肌电激活差异

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摘要

Locomotor state transitions are challenging for transfemoral (TF) amputees due to the lack of active knee control even in the current powered prosthetic devices. Myoelectric activation has been used successfully to classify steady-state locomotion states, but classification of transitions between locomotion states remains a challenge, especially for TF amputees. The purpose of this study was to determine if lower-extremity muscle activation differences between pre-transition and transition gait cycles occur in the involved or uninvolved limb of TF amputees during locomotion state transitions. Surface electromyography (EMG) was collected from residual muscles on the involved limb and from the uninvolved limb from five TF amputees as they transitioned between different locomotion states (level ground, ramp ascent/descent, stair ascent/descent). Statistical parametric mapping (SPM) was used to assess differences in activation. When analyzed as a group, the only significant differences were observed in the vastus lateralis of the uninvolved limb. High inter-subject variation reduced the significance of other pattern differences. Further inspection revealed that the individual subjects expressed three different recruitment patterns. These recruitment patterns may indicate compensatory strategies adopted by the subjects over the years since amputation. Furthermore, the separate recruitment patterns suggest the need for individualized locomotion transition classification algorithms rather than a general classification scheme.
机译:由于即使在当前的动力假体装置中也缺乏主动的膝关节控制,运动状态的转变对于经股(TF)截肢者来说是具有挑战性的。肌电激活已成功用于对稳态运动状态进行分类,但是运动状态之间转换的分类仍然是一个挑战,特别是对于TF截肢者而言。这项研究的目的是确定在运动状态转换过程中,TF截肢者的受累或未受累肢体在过渡前和过渡步态周期之间的下肢肌肉激活差异是否发生。表面肌电图(EMG)是从五个受累截肢者在不同运动状态(水平地面,坡道上升/下降,楼梯上升/下降)之间过渡时从受累肢体的残余肌肉和未受累肢体收集的。统计参数映射(SPM)用于评估激活差异。当作为一个整体进行分析时,仅在未受累肢体的股外侧外侧观察到显着差异。高的受试者间差异降低了其他模式差异的重要性。进一步检查发现,个体受试者表现出三种不同的征募模式。这些招募方式可能表明自截肢以来这些年来受试者所采用的补偿策略。此外,单独的征募模式表明需要个性化的移动过渡分类算法,而不是通用的分类方案。

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