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Differences in plantarflexor function during a stretch-shortening cycle task due to limb preference

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posted on 2017-06-02, 08:50 authored by Laura-Anne Furlong, Andrew J. Harrison
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.

History

School

  • Sport, Exercise and Health Sciences

Published in

Laterality: Asymmetries of Body, Brain and Cognition

Volume

20

Issue

2

Pages

128 - 140

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.

Publisher

© Taylor & Francis

Version

  • AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2015

Notes

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

ISSN

1357-650X

eISSN

1464-0678

Language

  • en

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