Comparison of three eccentric overload training strategies on power output and interlimb asymmetry in youth soccer players

Moreno-Azze, Alejandro, Arjol-Serrano, José Luis, Falcón-Miguel, David ORCID: https://orcid.org/0000-0001-9252-6971, Bishop, Chris ORCID: https://orcid.org/0000-0002-1505-1287 and Gonzalo-Skok, Oliver (2021) Comparison of three eccentric overload training strategies on power output and interlimb asymmetry in youth soccer players. International Journal of Environmental Research and Public Health, 18 (16) , e8270. pp. 1-12. ISSN 1660-4601 [Article] (doi:10.3390/ijerph18168270)

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Abstract

Background: The present study compared the effects of performing the lateral squat exercise in three different formats from eccentric overload training on concentric/eccentric peak/mean power and inter-limb asymmetries in young soccer players.

Methods: Forty-five young male (U-17) soccer players were distributed into three groups. Two groups performed the same training volume with both legs, beginning with the weaker leg (SVW, n = 15) or with the stronger leg (SVS, n = 15). The third group executed double volume with the weaker leg and also commenced with such leg (DVW, n = 15) in the lateral squat during a 10-week period. Pre- and post-intervention metrics included concentric and eccentric peak/mean power during the lateral squat test and their corresponding asymmetries.

Results: All groups improved all power variables. Concentric mean and peak power asymmetry were substantially reduced in the SVW (ES: 0.89), DVW (ES: 0.43), and in SVW (ES: 1.60). Eccentric mean and peak power asymmetry were also substantially decreased in SVW (ES: 0.81) and in DVW (ES: 0.68). Between-group analyses showed substantially better performance in concentric and eccentric variables with stronger and weaker legs in SVW and DVW groups compared with SVS.

Conclusions: Those groups which started with the weaker leg showed greater both power enhancements and reductions on inter-limb asymmetries.

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