Effects of reflex delays on postural control during unstable seated balance.

Journal of Biomechanics
N Peter ReevesKumpati S Narendra

Abstract

Patients with low-back pain (LBP) exhibit longer trunk muscle reflex latencies and poorer postural control than healthy individuals. We hypothesized that balance during a simulated postural control task would become impaired when the delays exhibited by LBP patients were incorporated into neuromuscular control. The task chosen for this investigation was seated balancing, which emphasizes trunk muscles' contribution in postural control. This task was modeled in Simulink as a fourth order linearized dynamic system with feedback delays. Optimization (minimizing error between experimental and model data) of state variables was used to determine neuromuscular control parameters. Experimental data were obtained from 7 subjects during 5 perturbation trials while balancing on the seat with eyes closed. Model accuracy, reflecting the ability of the model to capture the dynamics of seated balance, was correlated with seated balance performance (r=0.91, p<0.001). To minimize the risk of erroneous findings from inaccurate modeling, only the best five balancers' data were used for hypothesis testing. In these five subjects, feedback delays in modeled neuromuscular control were increased to determine their effect on task stability, trunk dis...Continue Reading

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Citations

May 13, 2010·Journal of Biomechanical Engineering·Yunfei XuJacek Cholewicki
Jul 5, 2013·PloS One·Nicholas V KarayannisPaul W Hodges
Nov 23, 2013·Journal of Biomechanics·N Peter ReevesClark J Radcliffe
Jul 27, 2011·European Journal of Applied Physiology·Jaap H van DieënJeroen van der Eb
Jan 25, 2016·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·E MaaswinkelJ H van Dieën
Feb 22, 2016·Journal of Biomechanics·A ShahvarpourC Larivière
May 7, 2013·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Noémie C DuclosSerge Mesure
Jan 21, 2011·Clinical Biomechanics·N Peter ReevesJacek Cholewicki
Dec 8, 2015·IEEE Transactions on Control Systems Technology : a Publication of the IEEE Control Systems Society·M Cody PriessClark Radcliffe
Jul 29, 2015·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Nathalie M C W OomenJaap H van Dieën
Apr 15, 2014·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Ali ShahvarpourChristian Larivière
May 31, 2017·Journal of Strength and Conditioning Research·Stephen C Glass, Robert W Albert
May 29, 2010·Medicine and Science in Sports and Exercise·Arend Jan BorghuisAt L Hof
Mar 3, 2010·Spine·Jaap H van DieënJos W R Twisk
May 2, 2015·Journal of Dynamic Systems, Measurement, and Control·M Cody PriessN Peter Reeves
Apr 26, 2019·The Journal of Orthopaedic and Sports Physical Therapy·N Peter ReevesPaul W Hodges
Sep 3, 2019·The Journal of Orthopaedic and Sports Physical Therapy
Sep 14, 2017·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·Maarten R PrinsJaap H van Dieën
Jul 2, 2021·Journal of Biomechanics·N Peter ReevesJacek Cholewicki

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