表面肌电图的信度研究

Reliability of surface electromyography

目的:探讨表面肌电图参数的变异性,为拓展表面肌电图的临床应用建立可靠的依据。方法:健康受试者进行伸膝等长收缩,以及10m自由步行的动态运动,分别记录下肢相关肌群表面肌电,考察各参数的变异系数。结果:对于静态收缩,即使分析时宽短至1s,除了AEMG以外,各参数的变异系数均<0.100。对于动态的步行运动,取1s的分析时宽,MF、MPF的平均变异系数近于0.100,ZCR、AEMG的平均变异系数在0.150左右。结论:无论静态收缩,还是动态收缩,表面肌电图的基本参数MF、MPF、ZCR、AEMG稳定可靠,变异系数一般不大于0.100—0.150。频域指标较时域指标的信度更高。

Objective：To explore the variability of sEMG parameters, lay the reliable foundation for extending clinical application of it.Metbod：A healthy examinee took knee joint isometric contraction; four others took lOm free walking. SEMG signals were recorded respectively from their correlative lower limbs muscles. The coefficient of variation of each parameter was investigated.Result：For the static contraction, the coefficient of variation of each parameter was less than 0.150 except for AEMG, even if the analytic duration short as 1 second. For the dynamic walking exercises, the averaged CV of MF,MPF was about 0.100,that of ZCR and AEMG was 0.150 or so.Conclusion：While isometric contraction or dynamic movement, SEMG basic parameters： MF, MPF, ZCR, AEMG are stable. Generally speaking, their CV is not more than 0.100-0.150. The reliability of frequency parameters is preferred to the time ones.