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Branched EMG electrodes for stable and selective recording of single motor unit potentials in humans

  • Lilia Christova , Diana Stephanova and Andon Kossev
Published/Copyright: February 22, 2007
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Biomedical Engineering / Biomedizinische Technik
From the journal Volume 52 Issue 1

Abstract

Branched surface EMG electrodes are bipolar electrodes with the hot signal pole referenced to two or more short-circuited leading-off surfaces. This technique provides stable recording of single motor unit potentials during real movements, up to maximal muscle contractions. The selective characteristic of branched electrodes is based on the same principles as the double differential detection system and spatial filtering technique proposed later. Equi-weight calculations to assess the selectivity of different electrode types and their position are used. The main advantage of branched electrodes, especially high stability, is achieved by the wire electrode version. The design, manufacture, implementation, and application of wire electrodes are discussed in detail. During recording of motor unit potentials, electrodes are positioned subcutaneously over the muscle fascia. This positioning maximizes electrode stability. Appropriate orientation of the electrode relative to the muscle architecture ensures adequate selectivity for single motor unit recordings. Branched electrodes require ordinary EMG equipment (two or even one amplifier).


Corresponding author: Andon Kossev, Medical School Hannover, Department of Neurology, 30623 Hannover, Germany Phone: +49-511-XXX Fax: +49-511-XXX

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Published Online: 2007-02-22
Published in Print: 2007-02-01

©2007 by Walter de Gruyter Berlin New York

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