Use of Signal Representation to Identify Abnormal Motor Unit Potentials in Macro EMG |
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Authors: | Nandedkar Sanjeev D Stalberg Erik Kim Yong I Sanders Donald B Anne Antharvedi |
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Affiliation: | Division of Neurology, Duke University Medical Center; |
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Abstract: | Macro electromyography (EMG) is a recently described recording technique allowing a nonselective recording of motor unit activity. The pick-up area of the electrode, the cannula of a modified single-fiber electrode, covers the entire motor unit territory. The motor unit potential (MUP) is obtained by averaging the cannula signals that are time locked to a single-fiber action potential. The MUP waveform is relatively insensitive to the position of the electrode within the motor unit. The amplitude of the MUP has been used as a measure of the size of the motor unit and normal values for the individual and median MUP amplitude have been defined. |
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