Modeling the stance leg in two-dimensional analyses of sprinting: inclusion of the MTP joint affects joint kinetics.

Bezodis, Neil E. and Salo, Aki I. T. and Trewartha, Grant (2012) Modeling the stance leg in two-dimensional analyses of sprinting: inclusion of the MTP joint affects joint kinetics. Journal of Applied Biomechanics, 28 (2). pp. 222-227. ISSN 1065-8483

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Official URL: http://dx.doi.org/10.1123/jab.28.2.222

Abstract

Two-dimensional analyses of sprint kinetics are commonly undertaken but often ignore the metatarsalphalangeal (MTP) joint and model the foot as a single segment. Due to the linked-segment nature of inverse dynamics analyses, the aim of this study was to investigate the effect of ignoring the MTP joint on the calculated joint kinetics at the other stance leg joints during sprinting. High-speed video and force platform data were collected from four to five trials for each of three international athletes. Resultant joint moments, powers, and net work at the stance leg joints during the first stance phase after block clearance were calculated using three different foot models. By ignoring the MTP joint, peak extensor moments at the ankle, knee, and hip were on average 35% higher (p < .05 for each athlete), 40% lower (p < .05), and 9% higher (p > .05), respectively, than those calculated with the MTP joint included. Peak ankle and knee joint powers and net work at all joints were also significantly (p < .05) different. By ignoring a genuine MTP joint plantar flexor moment, artificially high peak ankle joint moments are calculated, and these also affect the calculated joint kinetics at the knee.

Item Type: Journal Article
Uncontrolled Keywords: Biomechanics; Foot model; Joint moments; Metatarsal-phalangeal; Sprint start; Foot - Physiology; Joints - Physiology; Dynamics; Running
Subjects: 600 Technology > 612 Human physiology
700 The arts; fine & decorative arts; recreation > 796 Athletic & outdoor sports & games
School/Department: School of Sport, Health and Applied Science
Depositing User: Catherine O'Sullivan
Date Deposited: 24 Jun 2013 14:42
Last Modified: 16 Mar 2017 09:51
URI: http://research.stmarys.ac.uk/id/eprint/411

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