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Title: Kinetic asymmetry during running at preferred and non-preferred speeds
Authors: Furlong, Laura-Anne
Egginton, Natalie L.
Keywords: Injury
Training program design
Lower limb
Achilles tendon
Issue Date: 2018
Publisher: © American College of Sports Medicine. Published by Lippincott, Williams & Wilkins
Citation: FURLONG, L-A. and EGGINTON, N.L., 2018. Kinetic asymmetry during running at preferred and non-preferred speeds. Medicine and Science in Sports and Exercise, 50 (6), pp.1241–1248.
Abstract: PURPOSE: The aim of this study was to investigate the effect of altering preferred running speed by ±20% on kinetic asymmetry. METHODS: Three-dimensional motion analysis and force data were acquired from 15 healthy males (age: 27 ± 4.6 years, height: 1.81 ± 0.09 m, mass: 80.4 ± 12.4 kg) during their preferred running speed, and at ±20% of this speed. 3T magnetic resonance images were used to measure Achilles tendon cross-sectional area and moment arm, for use in calculation of tendon stress. Kinetic and tendon stress asymmetry were subsequently calculated in each condition using the symmetry index. RESULTS: Across all joints and conditions, average asymmetry of peak moments was between ±6% but higher individual values were observed; there was no effect of speed on magnitude of asymmetry. Ground contact times, vertical ground reaction forces and support and ankle moments (maximum absolute asymmetry: 9%) were more symmetrical than hip and knee moments (up to 18%). Individual joint contribution to support moment and positive work were similar in both limbs, and ankle and hip compensatory interactions were observed with alterations in running speed. Achilles tendon stress increased with increased running speed, with higher stress in the preferred limb; asymmetry in tendon stress was not related to asymmetry in vertical ground reaction forces. CONCLUSION: Results show small effects of altering running speed on kinetic asymmetry, but responses are individual-specific with interactions occurring between joints to maintain overall movement symmetry. Further research is needed to understand the mechanical and neuromuscular mechanisms underpinning these compensations.
Description: This paper is in closed access until 23rd Jan 2019
Version: Accepted for publication
DOI: 10.1249/MSS.0000000000001560
URI: https://dspace.lboro.ac.uk/2134/28099
Publisher Link: https://doi.org/10.1249/MSS.0000000000001560
ISSN: 0195-9131
Appears in Collections:Closed Access (Sport, Exercise and Health Sciences)

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