Asymmetry of erector spinae muscle activity in twisted postures and consistency of muscle activation patterns across subjects

Spine
Jaap H van Dieën

Abstract

An experimental study involving a repeated measures design was performed. To describe the muscle activation pattern in extending from a twisted posture; to evaluate interindividual variation of this pattern; and to study the effects of fatigue development. Extending the trunk from a twisted posture is a risk factor for low back pain. Twelve male subjects performed contractions at 20%, 40%, 60%, and 100% of maximum in a neutral position and 15 degrees, 30 degrees, and 45 degrees twisted posture. Surface electromyography of six bilateral back muscle tracts was recorded during these 5-second contractions and during sustained contractions at 0 degree and 30 degrees and 40% of maximum. The data show an asymmetry in muscle activation, increasing with angle of twist. Activity was higher contralateral to the direction of twisting. Linear regression analysis with angle and torque level against electromyographic amplitude yielded a significant fit in 92% of the data sets. In 75% of the subjects, the regression lines were similar. The divergence of the activation pattern in the other subjects appears to be explained by a higher co-contraction level of abdominal muscles. Fatigue caused a shift in activity to the more laterally situated mus...Continue Reading

References

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Citations

Aug 28, 2001·Journal of Biomechanics·C G de OliveiraJ Nadal
Mar 29, 2001·Clinical Biomechanics·P DolanM A Adams
Nov 5, 1999·Clinical Biomechanics·J H van DieënH M Toussaint
Oct 21, 1998·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·W S MarrasK P Granata
Sep 26, 2012·Journal of Strength and Conditioning Research·Evaristo Brotons-GilFrancisco J Vera-Garcia
May 11, 2010·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·M PraagmanH E J Veeger
Jan 12, 2005·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Didier StaudenmannJaap H van Dieën
Jul 16, 2002·Annual Review of Biomedical Engineering·Malcolm H PopeMarianne L Magnusson
Jan 15, 2004·The Journal of the American Dental Association·Bethany Valachi, Keith Valachi
Aug 10, 2013·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Si-hyun KimMoon-Hwan Kim

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