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Motor unit synchronization during fatigue: Described with a novel sEMG method based on large motor unit samples
Norwegian University of Science and Technology.
Östergötlands Läns Landsting, Reconstruction Centre, Department of Rehabilitation Medicine UHL.
University Hospital, Umeå.
Norwegian University of Science and Technology.
2009 (English)In: Journal of Electromyography and Kinesiology, ISSN 1050-6411, Vol. 19, no 2, 232-241 p.Article in journal (Refereed) Published
Abstract [en]

The amount of documented increase in motor unit (MU) synchronization with fatigue and its possible relation with force tremor varies largely, possibly due to inhomogeneous muscle activation and methodological discrepancies and limitations. The aim of this study was to apply a novel surface electromyographical (EMG) descriptor for MU synchronization based on large MU populations to examine changes in MU synchronization with fatigue at different sites of a muscle and its relation to tremor. Twenty-four subjects performed an isometric elbow flexion at 25% of maximal voluntary contraction until exhaustion. Monopolar EMG signals were recorded using a grid of 130 electrodes above the biceps brachii. Changes in MU synchronization were estimated based on the sub-band skewness of EMG signals and tremor by the coefficient of variation in force. The synchronization descriptor was dependent on recording site and increased with fatigue together with tremor. There was a general association between these two parameters, but not between their fluctuations. These results are in agreement with other surface EMG studies and indicate that the novel descriptor can be used to attain information of synchronization between large MU populations during fatigue that cannot be retrieved with intra-muscular EMG.

Place, publisher, year, edition, pages
2009. Vol. 19, no 2, 232-241 p.
Keyword [en]
Electrode location; Fatigue; Force tremor; Motor unit synchronization; Multi-channel surface EMG
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-18786DOI: 10.1016/j.jelekin.2007.08.008OAI: diva2:221789
Available from: 2009-06-05 Created: 2009-06-03 Last updated: 2012-01-06

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Department of Rehabilitation Medicine UHL
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ReferencesLink to record
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