The influence of electrode shift over the innervation zone and normalization on the electromyographic amplitude and mean power frequency versus isometric torque relationships for the vastus medialis muscle

Journal of Neuroscience Methods
Travis W BeckRussell Hendrix

Abstract

The purpose of the present study was to: (a) examine the influence of the innervation zone (IZ) for the vastus medialis on EMG signals from bipolar electrode arrangements that have their center point directly over the IZ, 10mm distal to the IZ, 10mm proximal to the IZ, and 20mm distal to the IZ, and (b) investigate the effects of normalization on EMG amplitude and center frequency values over the IZ. Ten men (mean+/-S.D. age=23.6+/-3.0 years) performed submaximal to maximal isometric muscle actions of the dominant leg extensors, and four separate bipolar surface EMG signals were detected simultaneously from the vastus medialis. One bipolar electrode arrangement had its center point located directly over the IZ, while the other electrode arrangements had their center points 10mm proximal, 10mm distal, and 20mm distal to the IZ. The results showed that there were no consistent patterns among the four electrode arrangements for the absolute and normalized EMG amplitude and mean power frequency (MPF) versus isometric torque relationships. Generally speaking, the IZ had the greatest effect on the EMG signal when the center point of the bipolar electrode arrangement was directly over it or 10mm proximal to it. In addition, normalizat...Continue Reading

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Citations

May 17, 2011·European Journal of Applied Physiology·Gillian Hatfield Murdock, Cheryl L Hubley-Kozey
Dec 14, 2011·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Kohei WatanabeToshio Moritani
Jul 15, 2011·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Marco BarberoRoberto Merletti
Jan 15, 2016·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Stephanie Valentin, Rebeka R Zsoldos
May 10, 2011·Journal of Neuroscience Methods·Dubravka M BojanicVojin R Ilic
Oct 30, 2010·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Clayton L CamicGlen O Johnson
Nov 16, 2010·Journal of Neuroscience Methods·Kevin G KeenanHillary D Gruszka
Dec 30, 2014·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Agnes HuebnerChristoph Anders
Jul 17, 2010·Journal of Strength and Conditioning Research·Tammy K EvetovichDonovan S Conley
Nov 12, 2015·Frontiers in Human Neuroscience·Bo YaoPing Zhou

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