What is it about?

The aim of this study was to investigate the effects of inter-electrode distance (IED), electrode radius (ER) and electrodes configurations on cross-correlation coefficient (CC) between motor unit action potentials (MUAPs) generated in a motor unit (MU) of parallel fibres and in a MU of inclined fibres with respect to the detection system. The fibres inclination angle (FIA) varied from 0° to 180° by a step of 5°. Six spatial filters (the longitudinal single differential (LSD), longitudinal double differential (LDD), bi-transversal double differential (BiTDD), normal double differential (NDD), inverse binomial filter of order two (IB2) and maximum kurtosis filter (MKF)), three values of IED and three values of ER were considered. A cylindrical multilayer volume conductor constituted by bone, muscle, fat and skin layers was used to simulate the MUAPs. The cross-correlation coefficient analysis showed that with the increase of the FIA, the pairs of MUAPs detected by the IB2 system were more correlated than those detected by the five other systems. For each FIA, the findings also showed that the MUAPs pairs detected by BiTDD, NDD, IB2 and MKF systems were more correlated with smaller IEDs than with larger ones, while inverse results were found with the LSD and LDD systems. In addition, the pairs of MUAPs detected by the LDD, BiTDD, IB2 and MKF systems were more correlated with large ERs than with smaller ones. However, inverse results were found with the LSD and NDD systems.

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Why is it important?

We showed that the increase in IED increased the DMMCC % value of the MUAPs detected by the IB2 and MKF systems. However, the increase of the ER decreased the DMMCC % value of the MUAPs detected by the IB2 and MKF systems. Inverse results were found with the LSD system. The lowest DMMCC% values in the case of IB2 system implies that the MUAP signals detected by this system are more correlated than those detected by the other five systems. As a result, we recommended the IB2 system to record sEMG signals generated from muscles with inclined fibres.

Perspectives

Using real EMG signals to validate our results

Dr. MESSAOUDI Noureddine
Universite M'Hamed Bougara Boumerdes

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This page is a summary of: Effects of detection system parameters on cross-correlations between MUAPs generated from parallel and inclined muscle fibres, March 2021, De Gruyter,
DOI: 10.2478/pjmpe-2021-0011.
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