Human Performance Laboratory, University of Calgary, Calgary, Alberta, Canada.
J Electromyogr Kinesiol. 2011 Feb;21(1):184-9. doi: 10.1016/j.jelekin.2010.10.004. Epub 2010 Nov 12.
A temporal pattern coding, synchronization and rhythmicity form an integral part of central nervous system information controlling the muscle activation. Rhythmic oscillations of muscles at frequencies of 35-60 Hz were already noted in the electromyograms by Piper (1907). The purpose of this study was to resolve the Piper rhythm in the EMG of the APB muscle and report the pacing frequencies of the Piper rhythm. The Piper rhythm was identified using the power of the EMG signals extracted by a wavelet transform at higher frequencies (170-271 Hz). The results showed distinct power of the intensity extracted by the wavelets in a frequency band ranging from about 30-60 Hz. The band was reflected in the power spectra of the EMG intensity and in the first eigenvector of a principal component analysis of the power spectra. The fact that the Piper rhythm shown in this study for the APB muscle yielded a large contribution to the total power means that one can use the frequency and amplitude of the Piper rhythm in future analysis of EMG signals to monitor the influence and changes of the central command.
时程编码、同步和节律是中枢神经系统控制肌肉激活信息的一个组成部分。肌肉的节律性振荡以 35-60Hz 的频率在肌电图中已经被 Piper（1907）记录到。本研究的目的是解析 APB 肌肉肌电图中的 Piper 节律，并报告 Piper 节律的起搏频率。通过在较高频率（170-271Hz）下使用小波变换提取肌电图信号的功率来识别 Piper 节律。结果表明，在大约 30-60Hz 的频带范围内，由小波提取的强度的功率是明显的。该频带反映在肌电图强度的功率谱和主成分分析的功率谱的第一特征向量中。本研究中显示的 APB 肌肉的 Piper 节律对总功率有很大贡献的事实意味着，人们可以在未来的肌电图信号分析中使用 Piper 节律的频率和幅度来监测中枢命令的影响和变化。
