Postural reactions of the trunk muscles to multi-directional perturbations in sitting

Clinical Biomechanics
Kei MasaniMilos R Popovic

Abstract

The dynamic role of the trunk musculature, with respect to stability, has not been fully explored to date. The purpose of this study was, using a transient and multi-directional perturbation, to: (1) quantify the tonic level of activity in the superficial trunk musculature prior to any perturbation; (2) quantify the phasic activity in those same muscles following application of a transient, horizontally directed load; and (3) quantify the direction-dependent behavior of this phasic response. Twelve healthy individuals were perturbed during sitting via a chest harness in eight horizontal directions. Surface electromyograms were measured bilaterally from the abdominal (rectus abdominis, internal and external obliques) and back musculature (thoracic and lumbar erector spinae) to determine the tonic muscle activity prior to perturbation, and the phasic response following perturbation. A descriptive model was used to characterize the relationship between the phasic response of the muscles due to perturbation and the pulling direction. Tonic activity in the trunk musculature in upright sitting is low, but still above resting levels by at about 1-3% of the MVC for the abdominal muscles, and 4-6% for the back muscles. Each trunk muscle...Continue Reading

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Citations

Jan 20, 2010·European Journal of Applied Physiology·Wim SaeysPaul Van de Heyning
Jan 10, 2016·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Matija MilosevicMilos R Popovic
Jan 25, 2016·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·E MaaswinkelJ H van Dieën
Dec 28, 2010·Human Movement Science·T W CacciatoreK E Ames
Mar 23, 2010·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Lev VaismanMilos R Popovic
Jun 28, 2012·IEEE Transactions on Bio-medical Engineering·Matija MilosevicMilos R Popovic
Apr 7, 2015·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·T C StenlundB Rehn
Nov 20, 2013·Medical Engineering & Physics·Albert H VetteMilos R Popovic
Nov 26, 2015·BioMed Research International·Nejc Sarabon, Jernej Rosker
Jun 15, 2017·The Journal of Spinal Cord Medicine·Sharon GabisonMary C Verrier
Jul 18, 2017·IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society·Kramay PatelKei Masani
Aug 17, 2018·Clinical Anatomy : Official Journal of the American Association of Clinical Anatomists & the British Association of Clinical Anatomists·Chenglei FanCarla Stecco
Mar 30, 2017·Journal of Motor Behavior·Victor SantamariaMarjorie Woollacott

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