Upper trapezius muscle conduction velocity during fatigue in subjects with and without work-related muscular disorders: a non-invasive high spatial resolution approach

European Journal of Applied Physiology
E SchulteC Disselhorst-Klug

Abstract

The development of fatigue at the muscle fibre level can be assessed in terms of a decrease in conduction velocity (CV). The present study aimed to investigate if work-related muscular disorders in occupations characterised by static loads of long duration affect fatigue resistance in the painful muscle. A group of eight secretaries suffering from bilateral chronic muscle pain in the shoulder/neck region was compared to a group of healthy subjects. The upper trapezius muscle was studied under isometric contractions, holding the arm in the horizontal plane up to the endurance point. Changes in CV estimated at the motor unit level were investigated using a non-invasive high spatial resolution electromyographic (EMG) approach. In addition, the number of motor unit potentials per second (PPS), and the root mean square (RMS) of bipolar signals were assessed, and the results reported as the mean and standard error for each value. Subjects with work-related disorders showed less pronounced changes in CV with respect to healthy subjects. No differences between subjects with and without work-related disorders were encountered for the PPS and RMS. The present findings on CV indicate an increased fatigue-related recruitment of MUs in the ...Continue Reading

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Citations

Oct 22, 2005·European Journal of Applied Physiology·Thomas LäubliGisela Sjøgaard
May 18, 2007·European Journal of Applied Physiology·Mitsutoshi KimuraTsugutake Sadoyama
Feb 6, 2007·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Andreas HoltermannKarin Roeleveld
Nov 7, 2006·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Gea DrostMachiel J Zwarts
Jun 23, 2006·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Laura A C KallenbergHermie J Hermens
Nov 7, 2012·Journal of Biomechanics·Amy V LavalleeDavid J Nuckley
Jun 17, 2011·The Clinical Journal of Pain·Susan Armijo-OlivoDavid J Magee

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