Analysis of phasic and tonic electromyographic signal characteristics: Electromyographic synthesis and comparison of novel morphological and linear-envelope approaches

Belavy, Daniel L., Mehnert, Andrew, Wilson, Stephen and Richardson, Carolyn A. (2009) Analysis of phasic and tonic electromyographic signal characteristics: Electromyographic synthesis and comparison of novel morphological and linear-envelope approaches. Journal of Electromyography and Kinesiology, 19 1: 10-21.


Author Belavy, Daniel L.
Mehnert, Andrew
Wilson, Stephen
Richardson, Carolyn A.
Title Analysis of phasic and tonic electromyographic signal characteristics: Electromyographic synthesis and comparison of novel morphological and linear-envelope approaches
Journal name Journal of Electromyography and Kinesiology   Check publisher's open access policy
ISSN 1050-6411
Publication date 2009-02
Year available 2007
Sub-type Article (original research)
DOI 10.1016/j.jelekin.2007.02.018
Volume 19
Issue 1
Start page 10
End page 21
Total pages 13
Editor T. Moritani
M. Solomonow
Place of publication United Kingdom
Publisher Elsevier Ltd
Collection year 2008
Language eng
Subject 291500 Biomedical Engineering
671402 Medical instrumentation
C1
Formatted abstract The pattern of tonic and phasic components in an EMG signal reflects the underlying behaviour of the central nervous system (CNS) in controlling the musculature. One avenue for gaining a better understanding of this behaviour is to seek a quantitative characterisation of these phasic and tonic components. We propose that these signal characteristics can range between unvarying, tonic and intermittent, phasic activation through a continuum of EMG amplitude modulation. In this paper, we present two new algorithms for quantifying amplitude modulation: a linear-envelope approach, and a mathematical morphology approach. In addition we present an algorithm for synthesising EMG signals with known amplitude modulation. The efficacy of the synthesis algorithm is demonstrated using real EMG data. We present an evaluation and comparison of the two algorithms for quantifying amplitude modulation based on synthetic data generated by the proposed synthesis algorithm. The results demonstrate that the EMG synthesis parameters represent 91.9% and 96.2% of the variance of linear-envelopes extracted from lumbo-pelvic muscle EMG signals collected from subjects performing a repetitive-movement task. This depended, however, on the muscle and movement-speed considered (F = 4.02, p < 0.001). Coefficients of determination between input and output amplitude modulation variables were used to quantify the accuracy of the linear-envelope and morphological signal processing algorithms. The linear-envelope algorithm exhibited higher coefficients of determination than the most accurate morphological approach (and hence greater accuracy, T = 8.16, p < 0.001). Similarly, the standard deviation of the coefficients of determination was 1.691 times smaller (p < 0.001). This signal processing algorithm represents a novel tool for the quantification of amplitude modulation in continuous EMG signals and can be used in the study of CNS motor control of the musculature in repetitive-movement tasks.
Keyword Surface electromyography
Repetitive-movement
Motor control
Amplitude modulation
Phasic
Tonic
Q-Index Code C1
Q-Index Status Confirmed Code

 
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