PMID: 8945650Dec 1, 1996Paper

Dominant role of interface over knee angle for cushioning impact loading and regulating initial leg stiffness

Journal of Biomechanics
M A LafortuneM J Lake

Abstract

For in vivo impact loadings administered under controlled initial conditions, it was hypothesized that larger initial knee angles (IKA) and softer impacting interfaces would reduce impact loading and initial leg stiffness. A human pendulum was used to deliver controlled impacts to the right foot of 21 subjects for three IKA (0, 20 and 40 degrees) and three interfaces (barefoot, soft and hard EVA foams). The external impact force and the shock experienced by the subjects' shank were measured simultaneously with a wall mounted force platform and a skin mounted accelerometer, respectively. Stiffness of the leg was derived using impact velocity and wall reaction force data. The results disproved the role of the knee joint in regulating initial leg stiffness and provided only partial support for the hypothesized improved cushioning. Larger knee flexion at contact reduced impact force but increased the shock travelling throughout the shank. Conversely, softer interfaces produced sizable reductions in both initial leg stiffness and severity of the impact experienced by the lower limb. Force rate of loading was found to be highly correlated (r = 0.95) to limb stiffness that was defined by the heel fat pad and interface deformations. Th...Continue Reading

Citations

Sep 1, 2004·Journal of Biomechanics·Katherine A Boyer, Benno M Nigg
Jun 21, 2001·Clinical Biomechanics·I.C. WrightB.M. Nigg
Sep 5, 2001·Acta Physiologica Scandinavica·S FukashiroA Shibayama
Jul 10, 2008·Sports Biomechanics·Songning ZhangYeon-Joo Yu
Feb 15, 2001·Clinical Journal of Sport Medicine : Official Journal of the Canadian Academy of Sport Medicine·B M Nigg
Mar 2, 2002·Journal of Biomechanical Engineering·Kurt M DeGoedeNeil B Alexander
Dec 11, 2007·Journal of Biomechanical Engineering·K J MartinM L Hull
Jun 29, 2010·Medicine and Science in Sports and Exercise·Bryan C HeiderscheitMichael B Ryan
Oct 27, 2009·Journal of Strength and Conditioning Research·Allan BrenneckeJúlio C Serrão
Dec 21, 2007·Journal of Physiological Anthropology·Seiji SaitoYutaka Tochihara
Jul 25, 2015·Sports Biomechanics·Ceri DissDavid G Kerwin
Dec 24, 2004·IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society·Jan AndrysekWilliam L Cleghorn
Mar 3, 2009·The Journal of Orthopaedic and Sports Physical Therapy·Eleftherios Kellis, Christina Liassou
May 24, 2013·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Federico París-GarcíaFederico París
Nov 10, 2006·Journal of Biomechanics·Amir Abbas ZadpoorAhmad Reza Arshi
Dec 4, 2014·Medical Engineering & Physics·Erin BoutwellSteven Gard
Mar 10, 2015·Journal of medical and biological engineering·Joseph Mizrahi
Jul 19, 2013·Medicine and Science in Sports and Exercise·Roozbeh Naemi, Nachiappan Chockalingam

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