Seasonal variation of inter-limb jumping asymmetries in youth team-sport athletes

Fort-Vanmeerhaeghe, Azahara ORCID logoORCID:, Bishop, Chris ORCID logoORCID:, Buscà, Bernat, Vicens-Bordas, Jordi and Arboix-Alió, Jordi (2021) Seasonal variation of inter-limb jumping asymmetries in youth team-sport athletes. Journal of Sports Sciences, 39 (24) . pp. 2850-2858. ISSN 0264-0414 [Article] (doi:10.1080/02640414.2021.1968123)

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The main objective of the present study was to provide seasonal variation data for inter-limb asymmetry in youth elite team-sport athletes. Fifty-nine players performed the single leg countermovement jump (SLCMJ) and the one leg hop for distance (OLHT) tests during pre-season, mid-season and end-season. A repeated-measures analysis of variance was conducted to determine magnitude differences in asymmetry scores between time points. Kappa coefficients (κ) were calculated to determine the levels of agreement for the direction of asymmetry. When comparing inter-limb asymmetry magnitudes across the season, the SLCMJ test showed significantly higher asymmetries at mid-season in comparison with pre-season and end-season (p<0.01, d=-1.03 for pre to mid; p<0.01, d=1.12 for pre to end). However, OLHT inter-limb asymmetry magnitude remained consistent throughout the season (ES range=-0.02 to -0.06). For the direction of asymmetry, levels of agreement ranged from poor to slight in the SLCMJ (k-0.10 to 0.18) and in the OLHT (k-0.21 to 0.18). No significant differences were found between mean asymmetry values at any time point or for either test when comparing males and females. In conclusion, jump height asymmetry during the SLCMJ was the only metric to show significant magnitude changes across the season.

Item Type: Article
Keywords (uncontrolled): youth, between-limb differences, jumping, Imbalances, longitudinal tracking
Research Areas: A. > School of Science and Technology > London Sport Institute > Strength and Conditioning at the London Sport Institute
Item ID: 33734
Notes on copyright: This is an Accepted Manuscript of an article published by Taylor & Francis in Journal of Sports Sciences on 19 Aug 2021, available online:
Useful Links:
Depositing User: Chris Bishop
Date Deposited: 16 Aug 2021 15:08
Last Modified: 29 Nov 2022 17:38

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