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近年来的研究证明,表面肌电信号具有非高斯与非线性的属性.随着施力水平增加,肌肉运动单元募集数量和发放率相应增加.因此,提出一个假设:sEMG信号的非高斯性和非线性水平与肌肉运动单元募集数量以及发放率相关.该假设只在实验性研究中被讨论过.本文使用一个包含空间信息(运动单元募集)和时间信息(3种FRs)的仿真sEMG模型检验此假设.双频域的高阶谱统计方法检验仿真sEMG信号的非高斯和非线性水平.采用多因素分析法对肌肉的nMUs及FR进行分析,查找这两个因素对sEMG非高斯和非线性水平的影响程度.通过二元相关性检验衡量3种FRs情况下nMUs与sEMG非高斯水平的相关密切程度,以及nMUs与sEMG非线性水平的相关密切程度.结果显示,nMUs,FRs及nMUs与FRs之间的交互效应都会对sEMG的非高斯和非线性水平产生影响.nMUs分别与sEMG的非高斯、非线性水平之间存在负相关关系.即在3种FRs情况下,随着肌力的增加,nMUs增加,sEMG趋于高斯和线性分布.本研究有效地限制了实验的干扰因素对sEMG非高斯与非线性水平的影响,并定量地描述了实验不能直接反映的肌肉nMUs和FRs与非高斯性、非线性之间的关系.本实验结果对肌肉活动能力的评估和假肢控制的研究具有指导意义.
In recent years, studies have shown that surface EMG has non-Gaussian and non-linear properties.As the force level increases, the number of muscle movement units raised and the corresponding increase rate.Therefore, a hypothesis: sEMG signal non-Gaussian and The nonlinearity is related to the number of mobilization units and the rate of release.The hypothesis is only discussed in the experimental study.In this paper, a simulated sEMG model test including spatial information (motion unit recruitment) and time information (3 types of FRs) The hypothesis is that high-order spectral statistics in the dual-frequency domain test the non-Gaussian and nonlinear levels of simulated sEMG signals.Multivariate analysis is used to analyze nMUs and FRs in muscles to find out the effect of these two factors on sEMG non-Gaussian and nonlinear The correlation between nMUs and sEMG non-Gaussian levels and the correlation between nMUs and sEMG non-linearity were measured by binary correlation test.The results showed that nMUs, FRs and nMUs were positively correlated with FRs The interaction between sEMG and non-Gaussian non-linear level will have an impact.nMUs and sEMG non-Gaussian, non-linear level between the negative correlation, that is, Under the three kinds of FRs, nMUs increased and sEMG tended to Gaussian and linear distribution with the increase of muscle strength.This study effectively limited the influence of experimental interference factors on the non-Gaussian and nonlinear sEMG levels and described quantitatively The experiments can not directly reflect the relationship between muscle nMMS and FRs and non-Gaussian, non-linear.The results of this study on the assessment of muscle activity and prosthetic control with guidance.