经穴位电刺激下的表面肌电信号特征分析

Feature Analysis on Surface EMG Signals under Transcutanclus Electric Acupoint Stimulation

目的:探究人体穴位电刺激与相关肌肉活动的关系,通过对经穴刺激诱发的表面肌电信号进行特征分析,阐明经穴电刺激下的肌电信号时域、频域特征参数变化与肌肉的激活程度、疲劳程度之间的定量关系,为康复工程和运动医学研究提供参考依据。方法:以8名健康青年志愿者为研究对象,设计穴位电刺激和自主收缩两种实验模式,采集记录两种模式下对应的指伸肌和尺侧腕屈肌的表面肌电信号,提取表面肌电信号均方根值、平均功率频率、中值频率等特征值,并分析其功率谱变化。通过配对t检验,分析经穴电刺激和自主动作模式的肌电信号特征差异。结果:在经穴电刺激模式下,对应的表面肌电信号均方根幅度增大,且经穴电刺激后,肌电信号的谱分布向高频方向移动,肌电的平均功率频率和中值频率随着刺激时间的延长保持稳定。结论:表明对曲池穴和内关穴位电刺激,能够激活对应的指伸肌和尺侧腕屈肌更多的快肌纤维,使肌肉激活程度提高,对缓解肌肉疲劳具有一定作用。

Objective To explore the relation between the human＇s acupoint stimulation and muscle activities. And to clarify therelation between characteristic parameters change of surface EMG （sEMG） signals on the time domain, frequency domain andthe muscle activation and fatigue levels under the characteristics analysis of the sEMG signals evoked by transcutanclus electricacupoint stimulation （TEAS）. This wilt provide a reference basis for the study of rehabilitation and sports medicine. MethodsEight healthy people objects participated in this study. We designed two different patterns, namely transcutanclus electric acu-point stimulation （TEAS） and muscle voluntary contraction. The sEMG signals of extensor digitorum and flexor carpi ulnariswere acquired. Then, the root mean square（RMS）, mean power frequency （MPF）, median frequency （MDF） of sEMG were ex-tracted, and the Power spectral density（PSD） of sEMG signals was analyzed. Last, the characteristic difference of muscle activityunder two different patterns was analyzed by the paired t test. Results RMS amplitude of corresponding sEMG increases underthe TEAS. In addition, after the TEAS, spectral distribution of sEMG signal moves to higher frequency, and the MPF and MDFofsEMG are stable with stimulation time extended. Conclusion It indicates that more fast-twitch muscle fibers are activated andthe degree of muscle activation is improved by Stimulating QuChi and NeiGuan acupoint, which plays an important role in mus-cle fatigue alleviating.