Mito K, Sakamoto K
Department of Communications and Systems, University of Electro-Communications, Tokyo, Japan.
Electromyogr Clin Neurophysiol. 2002 Apr-May;42(3):137-49.
The surface myoelectric signal during 20% maximum voluntary contraction was measured in m. biceps brachii using array electrodes for ten subjects in order to evaluate the distribution of muscle fiber conduction velocity (MFCV) in a whole muscle. MFCV was estimated by two calculating methods of the peak maximum method and the cross-correlation method from the myoelectric signals which were processed by techniques of the averaging and the non-averaging. It was found that the values of MFCV depended on the location irrespective of the kind of calculating method used and the kind of processing technique of myoelectric signal. In both the motor end-plate zone and the tendon zone, the values of MFCV showed more than 7.0 m/s. In the regions other than the motor end-plate zone and the tendon zone, the values of MFCV showed about 3.90 m/s which were almost constant. The statistical differences of the values of MFCV were in the same locations measured not recognized between the two calculating methods nor between the two processing techniques. In the cross-correlation method, the relation between MFCV and the electrode location was evaluated by both the maximum correlation coefficient and the amplitude ratio between the different neighboring channels to evaluate the conductive waveform properties of action potentials. The changes of parameters (i.e., MFCV, maximum correlation coefficient and amplitude ratio) depended on the electrode location. The values of MFCV significantly increased in the regions of the motor end-plate zone and the tendon zone, where the maximum correlation coefficient and amplitude ratio significantly decreased. The values of the coefficient of variance (CV) of three parameters in those regions were larger than those in other regions, i.e., the regions other than the motor end-plate zone and the tendon zone. A high maximum correlation coefficient and a high amplitude ratio were necessary for a reliable measurement of the MFCV.
为了评估整块肌肉中肌纤维传导速度（MFCV）的分布情况，使用阵列电极对10名受试者肱二头肌在最大自主收缩20%时的表面肌电信号进行了测量。通过对肌电信号采用平均和非平均技术处理后，利用峰值最大法和互相关法这两种计算方法来估计MFCV。结果发现，MFCV的值取决于位置，与所使用的计算方法种类和肌电信号处理技术种类无关。在运动终板区和肌腱区，MFCV的值均超过7.0 m/s。在运动终板区和肌腱区以外的区域，MFCV的值约为3.90 m/s，几乎恒定。两种计算方法之间以及两种处理技术之间，在相同测量位置的MFCV值的统计差异均未被识别。在互相关法中，通过最大相关系数以及不同相邻通道之间的幅度比来评估MFCV与电极位置之间的关系，以评估动作电位的传导波形特性。参数（即MFCV、最大相关系数和幅度比）的变化取决于电极位置。在运动终板区和肌腱区，MFCV的值显著增加，而最大相关系数和幅度比则显著降低。这些区域中三个参数的变异系数（CV）值大于其他区域，即运动终板区和肌腱区以外的区域。对于可靠测量MFCV，需要高的最大相关系数和高的幅度比。
