Seasonal variation of physical performance, bilateral deficit and inter-limb asymmetry in elite academy soccer players: which metrics are sensitive to change?

Bishop, Chris ORCID logoORCID: https://orcid.org/0000-0002-1505-1287, Abbott, Will, Brashill, Calum, Loturco, Irineu ORCID logoORCID: https://orcid.org/0000-0003-1309-2568, Beato, Marco ORCID logoORCID: https://orcid.org/0000-0001-5373-2211 and Turner, Anthony N. ORCID logoORCID: https://orcid.org/0000-0002-5121-432X (2022) Seasonal variation of physical performance, bilateral deficit and inter-limb asymmetry in elite academy soccer players: which metrics are sensitive to change? Journal of Strength and Conditioning Research . ISSN 1064-8011 [Article] (Accepted/In press)

[img] PDF - Final accepted version (with author's formatting)
Restricted to Repository staff and depositor only
Available under License Creative Commons Attribution-NonCommercial 4.0.

Download (537kB)

Abstract

This study aimed to report seasonal variations for: 1) physical performance, 2) inter-limb asymmetry and, 3) BLD data over the course of a competitive soccer season, and determine which metrics are sensitive to change. This study used a repeated measures observational design for 19 under-20 elite academy soccer players (age: 17.58 ± 0.61 years; height: 1.81 ± 0.09 m; body mass: 74.36 ± 7.58 kg), who conducted bilateral and single leg countermovement jumps (CMJ and SLCMJ), linear speed (5, 10, 20 and 30-m) and 505 change of direction (COD) speed tests, at pre, mid and end of season time points. For jump tests, jump height, reactive strength index modified (RSI-Mod), time to take-off and countermovement depth metrics were monitored, with inter-limb asymmetry and the bilateral deficit (BLD) also calculated for each. Significant improvements (p < 0.05) in performance were evident in all fitness tests: CMJ (ES: 0.61 to 1.03), SLCMJ (ES: 0.60 to 2.25), linear speed (ES: -0.54 to -1.96) and COD speed (ES: -0.68 to -1.14). Significant reductions in asymmetry (ES: -0.68 to -1.07) and significant increases in the BLD (ES: 1.15 to 1.57) were also evident throughout the season. Additionally, Kappa coefficients were used to determine consistency in limb dominance throughout the season, but only poor to fair levels of agreement (K: -0.17 to 0.37) were evident, highlighting the fluctuating nature of limb dominance throughout the season. Despite all tests exhibiting meaningful change, the SLCMJ and linear speed showed the most frequent and largest differences in performance, highlighting their usefulness in the ongoing monitoring process of physical capacities in elite male academy players across a competitive soccer season.

Item Type: Article
Research Areas: A. > School of Science and Technology > London Sport Institute > Strength and Conditioning at the London Sport Institute
Item ID: 34596
Useful Links:
Depositing User: Chris Bishop
Date Deposited: 25 Jan 2022 16:39
Last Modified: 29 Nov 2022 17:36
URI: https://eprints.mdx.ac.uk/id/eprint/34596

Actions (login required)

View Item View Item

Statistics

Activity Overview
6 month trend
1Download
6 month trend
127Hits

Additional statistics are available via IRStats2.