一种利用肌肉激活特性调制和评估功能性电刺激的方法

A method of modulation and evaluation for functional electrical stimulation based on muscle activation properties

提出一种基于肌肉激活生理特性的足下垂功能性电刺激调制与评估方法.结合肌肉募集的死区和饱和特性,利用自然步态下胫骨前肌的肌电信号和电刺激下胫骨前肌的耐受值和阈值调制电刺激输出曲线.研究基于1-范数的方法量化肌肉在电激活下的肌电信号募集水平评估所提出的电刺激调制方法的性能.通过实验比较了肌电信号调制电刺激时的胫骨前肌电诱发募集特性和自然激活时的募集特性,二者的相关系数达到0.8815.结果表明,利用自然激活方式调制电刺激的输出方式是有效的,而基于肌肉激活程度的评价指标具有可行性.

A method of modulation and evaluation of functional electrical stimulation(FES)based on physiological properties of muscle activation is proposed in this paper.Considering the dead zone and saturation characteristics of the recruitment curves of muscles,the tibialis anterior(TA)electromyography(EMG)of natural gait,tolerance and threshold values of TA are used to modulate FES output.The 1-norm is used to quantify the recruitment level of TA EMG during electrical induced activation aimed to evaluate the proposed method performance.The experiment results show that the TA’s recruitment curve under electrical stimulation has a high similarity with it in natural activation,and the correlation coefficient achieves 0.881 5.This result indicates that the proposed FES output modulation pattern is superior,and the evaluation method based on muscle recruitment is feasible.