Trunk muscle activation and associated lumbar spine joint shear forces under different levels of external forward force applied to the trunk

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
I KingmaJaap H van Dieën

Abstract

High anterior intervertebral shear loads could cause low back injuries and therefore the neuromuscular system may actively counteract these forces. This study investigated whether, under constant moment loading relative to L3L4, an increased externally applied forward force on the trunk results in a shift in muscle activation towards the use of muscles with more backward directed lines of action, thereby reducing the increase in total joint shear force. Twelve participants isometrically resisted forward forces, applied at several locations on the trunk, while moments were held constant relative to L3L4. Surface EMG and lumbar curvature were measured, and an EMG-driven muscle model was used to calculate compression and shear forces at all lumbar intervertebral joints. Larger externally applied forward forces resulted in a flattening of the lumbar lordosis and a slightly more backward directed muscle force. Furthermore, the overall muscle activation increased. At the T12L1 to L3L4 joint, resulting joint shear forces remained small (less than 200N) because the average muscle force pulled backward relative to those joints. However, at the L5S1 joint the average muscle force pulled the trunk forward so that the increase in muscle fo...Continue Reading

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Citations

Apr 20, 2010·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·R VicarsR M Hall
Dec 18, 2012·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Manish ChadhaVivek Kochar
Jun 29, 2010·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Guido B van SolingeBarend J van Royen
Sep 18, 2013·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Arno BisschopBarend J van Royen
Mar 17, 2010·Experimental Brain Research·Nienke W WilligenburgJaap H van Dieën
Mar 20, 2012·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Arno BisschopJaap H van Dieën
Feb 14, 2016·Journal of Biomechanics·Marcel DreischarfHendrik Schmidt
Mar 20, 2012·Journal of Human Evolution·Katherine K Whitcome
Jun 15, 2011·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Jacek CholewickiN Peter Reeves
Nov 4, 2015·Der Unfallchirurg·T R Oxland
Mar 22, 2014·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Z El OuaaidA Plamondon
Feb 14, 2018·International Journal of Occupational Safety and Ergonomics : JOSE·Jackie D ZehrTyson A C Beach
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Mar 22, 2013·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Young Eun Kim, Hae Won Choi
Oct 5, 2011·Journal of Strength and Conditioning Research·Angus F BurnettKelvin W W Tan

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