Drop jump asymmetry is associated with reduced sprint and change-of-direction speed performance in adult female soccer players

Bishop, Chris and Turner, Anthony N. and Maloney, Sean and Lake, Jason and Loturco, Irineu and Bromley, Tom and Read, Paul (2019) Drop jump asymmetry is associated with reduced sprint and change-of-direction speed performance in adult female soccer players. Sports, 7 (1). ISSN 2075-4663

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Abstract

Studies that examine the effects of inter-limb asymmetry on measures of physical performance are scarce, especially in adult female populations. The aim of the present study was to establish the relationship between inter-limb asymmetry and speed and change-of-direction speed (CODS) in adult female soccer players. Sixteen adult players performed a preseason test battery consisting of unilateral countermovement jump (CMJ), unilateral drop jump (DJ), 10 m, 30 m, and 505 CODS tests. Inter-limb asymmetry was calculated using a standard percentage difference equation for jump and CODS tests, and Pearson's r correlations were used to establish a relationship between asymmetry and physical performance as well as asymmetry scores themselves across tests. Jump-height asymmetry from the CMJ (8.65%) and DJ (9.16%) tests were significantly greater (p < 0.05) than asymmetry during the 505 test (2.39%). CMJ-height asymmetry showed no association with speed or CODS. However, DJ asymmetries were significantly associated with slower 10 m (r = 0.52; p < 0.05), 30 m (r = 0.58; p < 0.05), and 505 (r = 0.52⁻0.66; p < 0.05) performance. No significant relationships were present between asymmetry scores across tests. These findings suggest that the DJ is a useful test for detecting existent between-limb asymmetry that might in turn be detrimental to speed and CODS performance. Furthermore, the lack of relationships present between different asymmetry scores indicates the individual nature of asymmetry and precludes the use of a single test for the assessment of inter-limb differences.

Item Type: Article
Additional Information: Article number = 29. ** From PubMed via Jisc Publications Router. ** History: received 25-10-2018; revised 18-01-2019; accepted 21-01-2019.
Keywords (uncontrolled): inter-limb differences, jumping, performance reduction
Research Areas: A. > School of Science and Technology > London Sport Institute > Strength and Conditioning at the London Sport Institute
Item ID: 26142
Notes on copyright: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
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SWORD Depositor: Jisc Publications Router
Depositing User: Jisc Publications Router
Date Deposited: 07 Feb 2019 10:14
Last Modified: 25 Feb 2019 09:46
URI: http://eprints.mdx.ac.uk/id/eprint/26142

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