Compensation for the Distortion of Bipolar Surface EMG Signals Caused by Innervation Zone Movement

Hidekazu KANEKO  Tohru KIRYU  Yoshiaki SAITOH  

IEICE TRANSACTIONS on Information and Systems   Vol.E79-D   No.4   pp.373-381
Publication Date: 1996/04/25
Online ISSN: 
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Bio-Cybernetics and Neurocomputing
innervation zone,  conduction velocity,  multichannel EMG,  inverse filtering,  brachial biceps,  

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A novel method of multichannel surface EMG processing has been developed to compensate for the distortion in bipolar surface EMG signals due to the movement of innervation zones. The distortion of bipolar surface EMG signals was mathematically described as a filtering function. A compensating technique for such distorted bipolar surface EMG signals was developed for the brachial biceps during dynamic contractions in which the muscle length and tension change. The technique is based on multichannel surface EMG measurement, a method for estimating the movement of an innervation zone, and the inverse filtering technique. As a result, the distorted EMG signals were compensated and transformed into nearly identical waveforms, independent of the movement of the innervation zone.