Open AccessCross-correlation analysis of isometric contraction for mechanomyography signals on forearm muscle
Author(s) -
M. R. Mohamad Ismail,
Chee Kiang Lam,
Kenneth Sundaraj,
Mohd Hafiz Fazalul Rahiman
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/705/1/012014
Subject(s) - isometric exercise , forearm , flexor carpi ulnaris , medicine , anatomy , flexor muscles , extensor carpi ulnaris , physical medicine and rehabilitation , physical therapy , elbow , ulnar nerve
This study examines the cross-correlation coefficient of Mechanomyography (MMG) signals recorded from Palmaris Longus (PL), Flexor Digitorum Superficialis (FDS), Extensor Digitorum (ED) and Extensor Carpi Ulnaris (ECU) of forearm muscles during isometric muscle action. Nine healthy participants using dominant hand (mean±SD: age=24.78±1.79 year) volunteered in this study to perform submaximal to maximal (25%, 50%, 75% and 100%) isometric muscle actions with maximal voluntary contraction force of hand exercise gestures (grip strength supinated, grip strength pronated, finger flexion and pinch grip). During each isometric contraction, four-separated VMG sensor (TSD250A)-sensitive accelerometer type was used to record MMG signals on flexor and extensor side of forearm muscles. Maximum crosscorrelation coefficients at zero time lags were analyzed between flexor (PL & FDS) and extensor (ED & ECU) sides for each subject and force level to determine which sides show high level of association during isometric muscle action of forearm with different hand exercise gestures. The results showed maximum cross-correlation coefficients that range from R xy = 0.801 – 0.943 for all hand exercise gestures performed. In addition, from the results obtained between flexor and extensor side indicates that the maximum range of cross-correlation coefficient for extensor side muscle groups were slightly higher than the flexor side muscle groups.