Intra-session and Inter-day Reliability of the Myon 320 Electromyography System During Sub-maximal Contractions.

Graeme G Sorbie,James Brouner,Michael J Williams,Julien S Baker,Ukadike C Ugbolue,Neil Gibson,Chris Easton,David W Boyle,Alexander Gray

doi:10.3389/fphys.2018.00309

Abstract

Electromyography systems are widely used within the field of scientific and clinical practices. The reliability of these systems are paramount when conducting research. The reliability of Myon 320 Surface Electromyography System is yet to be determined. This study aims to determine the intra-session and inter-day reliability of the Myon 320 Surface Electromyography System. Muscle activity from fifteen participants was measured at the anterior deltoid muscle during a bilateral front raise exercise, the vastus lateralis muscle during a squat exercise and the extensor carpi radialis brevis (ECRB) muscle during an isometric handgrip task. Intra-session and inter-day reliability was calculated by intraclass correlation coefficient, standard error of measurement and coefficient of variation (CV). The normalized root mean squared (RMS) surface electromyographic signals produced good intra-session and inter-day testing intraclass correlation coefficient values (range: 0.63–0.97) together with low standard error of measurement (range: 1.49–2.32) and CV (range: 95% Confidence Interval = 0.36–12.71) measures for the dynamic-and-isometric contractions. The findings indicate that the Myon 320 Surface Electromyography System produces good to fair reliability when examining intra-session and inter-day reliability. Findings of the study provide evidence of the reliability of electromyography between trials which is essential during clinical testing.

Highlights

Electromyography (EMG) is the study of electrical activity produced by skeletal muscles
Inter-day reliability for the average normalized root mean squared (RMS) Surface EMG (sEMG) for the anterior deltoid (AD) during the bilateral front raise exercise produced good reliability [ICC (2, 5) = 0.94] and an acceptable coefficient of variation (CV) of 3.86%
The normalized RMS sEMG within the group of participants in the study displayed a strong correlation with the 50% MVIC during the intra (45.98%) and inter-day (45.91%) testing

Summary

Introduction

Electromyography (EMG) is the study of electrical activity produced by skeletal muscles. EMG signals can be recorded in many different ways; with electrodes being placed under the skin but over the muscle (subcutaneous EMG), in the muscles between the fibers (intramuscular EMG), or on the skin over the belly of the muscle (surface EMG) (Enoka, 2008). Surface EMG (sEMG) is a non-invasive technique that has been used to analyse muscle activity. The sEMG method has been used to diagnose muscle dysfunction for clinical purposes (Wakeling et al, 2007), provide insight into the neural control of gait (Byrne et al, 2007) and different. The usability of sEMG data is dependent on the reproducibility of the signal detection both within and between recording sessions (Hashemi Oskouei et al, 2013)

Objectives

Methods

Results

Discussion

Conclusion