Test-Retest Reliability of Trunk Motor Variability Measured By Large-Array Surface Electromyography

Abstract Objective The objective of this study was to evaluate the test-retest reliability of the trunk muscle activity distribution in asymptomatic participants during muscle fatigue using large-array surface electromyography (EMG). Methods Trunk muscle activity distribution was evaluated twice, wi...

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Bibliographic Details
Published in:Journal of manipulative and physiological therapeutics 2015-07, Vol.38 (6), p.359-364
Main Authors: Abboud, Jacques, MSc, Nougarou, François, PhD, Loranger, Michel, Descarreaux, Martin, DC, PhD
Format: Article
Language:English
Subjects:
Adult
Back Muscles - physiology
Electromyography
Electromyography - methods
Exercise Test - methods
Female
Healthy Volunteers
Humans
Male
Muscle Fatigue
Muscle Fatigue - physiology
Pectoralis Muscles - physiology
Physical Medicine and Rehabilitation
Reproducibility of Results
Sampling Studies
Spine
Young Adult
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Summary:Abstract Objective The objective of this study was to evaluate the test-retest reliability of the trunk muscle activity distribution in asymptomatic participants during muscle fatigue using large-array surface electromyography (EMG). Methods Trunk muscle activity distribution was evaluated twice, with 3 to 4 days between them, in 27 asymptomatic volunteers using large-array surface EMG. Motor variability, assessed with 2 different variables (the centroid coordinates of the root mean square map and the dispersion variable), was evaluated during a low back muscle fatigue task. Test-retest reliability of muscle activity distribution was obtained using Pearson correlation coefficients. Results A shift in the distribution of EMG amplitude toward the lateral-caudal region of the lumbar erector spinae induced by muscle fatigue was observed. Moderate to very strong correlations were found between both sessions in the last 3 phases of the fatigue task for both motor variability variables, whereas weak to moderate correlations were found in the first phases of the fatigue task only for the dispersion variable. Conclusion These findings show that, in asymptomatic participants, patterns of EMG activity are less reliable in initial stages of muscle fatigue, whereas later stages are characterized by highly reliable patterns of EMG activity.
ISSN:0161-4754
1532-6586
DOI:10.1016/j.jmpt.2015.06.007