Comparison of bilateral vs. unilateral-biased strength and power training interventions on measures of physical performance in elite youth soccer players

Stern, Darren, Gonzalo-Skok, Oliver, Loturco, Irineu ORCID: https://orcid.org/0000-0003-1309-2568, Turner, Anthony N. ORCID: https://orcid.org/0000-0002-5121-432X and Bishop, Chris ORCID: https://orcid.org/0000-0002-1505-1287 (2020) Comparison of bilateral vs. unilateral-biased strength and power training interventions on measures of physical performance in elite youth soccer players. Journal of Strength and Conditioning Research, 34 (8) . pp. 2105-2111. ISSN 1064-8011 (doi:10.1519/JSC.0000000000003659)

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Abstract

The aim of the present study was to compare the effects of bilateral and unilateral-biased strength and power training programs on measures of physical performance in male youth soccer players. Twenty-three elite youth players (age: 17.6  1.2 years) were randomly assigned to either a unilateral (n = 11) or a bilateral (n = 12) group, who completed a strength and power intervention, twice per week for 6-weeks. The unilateral group completed rear foot elevated split squats (RFESS), single leg countermovement jumps (SLCMJ), single leg drop jumps (SLDJ) and single leg broad jumps (SLBJ). The bilateral group intervention performed back squats, countermovement jumps (CMJ), drop jumps (DJ) and broad jumps (BJ). A 2 x 2 repeated measures ANOVA showed no between-group differences. However, within-group differences were evident. The bilateral training group showed significant (p < 0.05) improvements in back squat strength (d = 1.27; %Δ = 26.01), RFESS strength (d = 1.64; %Δ = 23.34), BJ (d = 0.76; %Δ = 5.12), 10 m (d = -1.17; %Δ = 4.29) and 30 m (d = -0.88; %Δ = 2.10) performance. The unilateral group showed significant (p < 0.05) improvements in RFESS strength (d = 1.40; %Δ = 33.29), SLCMJ on the left leg (d = 0.76; %Δ = 9.84), SLBJ on the left leg (d = 0.97; %Δ = 6.50), 10 m (d = -1.50; %Δ = 5.20), and 505 on the right leg (d = -0.78; %Δ = 2.80). Standardised mean differences showed that bilateral training favoured improvements in back squat strength and unilateral training favoured improvements in RFESS strength, SLDJ on the right leg and 505 on the right leg. These results show that although both training interventions demonstrated trivial to large improvements in physical performance, the notion of training specificity was evident with unilateral training showing greater improvements in unilateral test measures.

Item Type: Article
Research Areas: A. > School of Science and Technology > London Sport Institute > Strength and Conditioning at the London Sport Institute
Item ID: 29692
Notes on copyright: This is a non-final version of an article published in final form in: Stern, Darren, Gonzalo-Skok, Oliver, Loturco, Irineu, Turner, Anthony, Bishop, Chris, A Comparison of Bilateral vs. Unilateral-Biased Strength and Power Training Interventions on Measures of Physical Performance in Elite Youth Soccer Players, Journal of Strength and Conditioning Research: August 2020 - Volume 34 - Issue 8 - p 2105-2111 doi: 10.1519/JSC.0000000000003659
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Depositing User: Chris Bishop
Date Deposited: 17 Apr 2020 09:01
Last Modified: 27 Aug 2020 04:52
URI: https://eprints.mdx.ac.uk/id/eprint/29692

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