Magnitude or direction? Seasonal variation of interlimb asymmetry in elite academy soccer players
Article
Bishop, C., Read, P., Chavda, S., Jarvis, P., Brazier, J., Bromley, T. and Turner, A. 2022. Magnitude or direction? Seasonal variation of interlimb asymmetry in elite academy soccer players. The Journal of Strength and Conditioning Research. 36 (4), pp. 1031-1037. https://doi.org/10.1519/JSC.0000000000003565
Type | Article |
---|---|
Title | Magnitude or direction? Seasonal variation of interlimb asymmetry in elite academy soccer players |
Authors | Bishop, C., Read, P., Chavda, S., Jarvis, P., Brazier, J., Bromley, T. and Turner, A. |
Abstract | Previous research has highlighted a distinct lack of longitudinal data for asymmetry. The aims of the present study were to provide seasonal variation data for the magnitude and direction of asymmetry. Eighteen elite male academy soccer players (under-23) performed unilateral countermovement jumps (CMJ) and unilateral drop jumps (DJ) during pre, mid and end of season time points. Recorded metrics for asymmetry included: jump height and concentric impulse for the CMJ, and jump height and reactive strength index for the DJ. The magnitude of asymmetry showed trivial to small changes throughout the season (CMJ effect size range = -0.43 to 0.05; DJ effect size range = -0.18 to 0.41). However, Kappa coefficients showed poor to substantial levels of agreement for the direction of asymmetry during the CMJ (Kappa = -0.06 to 0.77) and DJ (Kappa = -0.10 to 0.78) throughout the season. These data show that when monitoring asymmetry, the magnitude alone may provide a false impression of consistent scores over time. In contrast, monitoring the direction of asymmetry highlights its task and variable nature, and is suggested as a useful tool for practitioners who wish to monitor asymmetry over the course of a competitive soccer season. |
Keywords | between-limb differences; longitudinal tracking; limb dominance |
Research Group | Strength and Conditioning at the London Sport Institute |
Publisher | Lippincott, Williams and Wilkins |
Journal | The Journal of Strength and Conditioning Research |
ISSN | 1064-8011 |
Electronic | 1533-4287 |
Publication dates | |
Online | 04 Mar 2020 |
30 Apr 2022 | |
Publication process dates | |
Deposited | 10 Feb 2020 |
Completed | 02 Aug 2019 |
Accepted | 16 Jan 2020 |
Output status | Published |
Accepted author manuscript | |
Copyright Statement | This is a non-final version of an article published in final form in: Bishop, C. et al., 2020. Magnitude or direction? Seasonal variation of inter-limb asymmetry in elite academy soccer players. Journal of Strength and Conditioning Research: April 2022 - Volume 36 - Issue 4 - p 1031-1037. Available at: https://doi.org/10.1519/JSC.0000000000003565. |
Digital Object Identifier (DOI) | https://doi.org/10.1519/JSC.0000000000003565 |
Web of Science identifier | WOS:000772137800022 |
Language | English |
https://repository.mdx.ac.uk/item/88w66
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