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Lookup NU author(s): Professor Kianoush Nazarpour, Professor Andrew Jackson
The probability density function (PDF) of the surface electromyogram (EMG) signals has been modelled with Gaussian and Laplacian distribution functions. However, a general consensus upon the PDF of the EMG signals is yet to be reached, because not only are there several biological factors that can influence this distribution function, but also different analysis techniques can lead to contradicting results. Here, we recorded the EMG signal at different isometric muscle contraction levels and characterised the probability distribution of the surface EMG signal with two statistical measures: bicoherence and kurtosis. Bicoherence analysis did not help to infer the PDF of measured EMG signals. In contrast, with kurtosis analysis we demonstrated that the EMG PDF at isometric, non-fatiguing, low contraction levels is super-Gaussian. Moreover, kurtosis analysis showed that as the contraction force increases the surface EMG PDF tends to a Gaussian distribution. (C) 2012 Elsevier Inc. All rights reserved.
Author(s): Nazarpour K, Al-Timemy AH, Bugmann G, Jackson A
Publication type: Article
Publication status: Published
Journal: Brain Research Bulletin
Year: 2013
Volume: 90
Pages: 88-91
Print publication date: 06/10/2012
Date deposited: 11/11/2013
ISSN (print): 0361-9230
ISSN (electronic): 1873-2747
Publisher: Elsevier
URL: http://dx.doi.org/10.1016/j.brainresbull.2012.09.012
DOI: 10.1016/j.brainresbull.2012.09.012
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