Comput Methods Programs Biomed - Simulation of surface EMG for the analysis of muscle activity during whole body vibratory stimulation.

Tópicos

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Resumo

This study aims to reproduce the effect of motor-unit synchronization on surface EMG recordings during vibratory stimulation to highlight vibration evoked muscle activity. The authors intended to evaluate, through numerical simulations, the changes in surface EMG spectrum in muscles undergoing whole body vibration stimulation. In some specific bands, in fact, vibration induced motion artifacts are also typically present. In addition, authors meant to compare the simulated EMGs with respect to real recordings in order to discriminate the effect of synchronization of motor units discharges with vibration frequencies from motion artifacts. Computations were performed using a model derived from previous studies and modified to consider the effect of vibratory stimulus, the motor unit synchronization and the endplates-electrodes relative position on the EMG signal. Results revealed that, in particular conditions, synchronization of MUs' discharge generates visible peaks at stimulation frequency and its harmonics. However, only a part of the total power of surface EMGs might be enclosed within artifacts related bands (? 1 Hz centered at the stimulation frequency and its superior harmonics) even in case of strong synchronization of motor units discharges with the vibratory stimulus.

Resumo Limpo

studi aim reproduc effect motorunit synchron surfac emg record vibratori stimul highlight vibrat evok muscl activ author intend evalu numer simul chang surfac emg spectrum muscl undergo whole bodi vibrat stimul specif band fact vibrat induc motion artifact also typic present addit author meant compar simul emg respect real record order discrimin effect synchron motor unit discharg vibrat frequenc motion artifact comput perform use model deriv previous studi modifi consid effect vibratori stimulus motor unit synchron endplateselectrod relat posit emg signal result reveal particular condit synchron mus discharg generat visibl peak stimul frequenc harmon howev part total power surfac emg might enclos within artifact relat band hz center stimul frequenc superior harmon even case strong synchron motor unit discharg vibratori stimulus

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