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Title: Differences in plantarflexor function during a stretch-shortening cycle task due to limb preference
Authors: Furlong, Laura-Anne
Harrison, Andrew J.
Keywords: Asymmetry
Limb dominance
Dynamical systems
Running
Injury
Issue Date: 2015
Publisher: © Taylor & Francis
Citation: FURLONG, L-A. and HARRISON, A.J., 2015. Differences in plantarflexor function during a stretch-shortening cycle task due to limb preference. Laterality: Asymmetries of Body, Brain and Cognition, 20(2), pp. 128-140.
Abstract: Most healthy humans move symmetrically at gross limb level but large kinetic and kinematic asymmetries have been observed at joint level during locomotion. The aim of this study was to assess muscle function asymmetries in healthy, active adults using an adapted force sledge apparatus which isolates the plantarflexors during a stretch-shortening cycle task. Peak force, rate of force development and stretch-shortening cycle function of preferred and non-preferred limbs were assessed in 21 healthy, active individuals using the adapted sledge and three-dimensional motion analysis. Between-limb differences and relationships were determined using paired t-tests/Wilcoxon-Signed rank test, Cohen’s dz, absolute symmetry index and Pearson’s r/Spearman’s rho. Significant differences with moderate effect size (ES) were observed in peak force (ES: 0.66), rate of peak force development (ES: 0.78), rate of force development in the first 50 ms (ES: 0.76), flight time (ES: 0.64) and stretch-shortening cycle function (0.68), with no difference in contact time or duration of eccentric loading. A small ES (0.56) was observed in rate of force development in the first 30 ms. The upper range of asymmetry observed (up to 44.9%) was larger than previously reported for healthy individuals, indicating compensations occur at proximal joints during locomotion to ensure symmetrical movement.
Description: This is an Accepted Manuscript of an article published by Taylor & Francis in Laterality on 30 May 2014, available online: http://dx.doi.org/10.1080/1357650X.2014.921688
Version: Accepted for publication
DOI: 10.1080/1357650X.2014.921688
URI: https://dspace.lboro.ac.uk/2134/25222
Publisher Link: http://dx.doi.org/10.1080/1357650X.2014.921688
ISSN: 1357-650X
Appears in Collections:Published Articles (Sport, Exercise and Health Sciences)

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