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Int J Sports Med 2019; 40(12): 796-802
DOI: 10.1055/a-0977-5478
Training & Testing
© Georg Thieme Verlag KG Stuttgart · New York

Eccentric-concentric Ratio: A Key Factor for Defining Strength Training in Soccer

F. Javier Nuñez
1   Physical Performance & Sports Research, University of Pablo de Olavide, Seville, Spain
,
Moisés de Hoyo
2   Physical Education and Sport, University of Seville, Seville, Spain
,
Alejandro Muñoz López
3   Sports and Computing, University Pablo de Olavide, Seville, Spain
,
Borja Sañudo
2   Physical Education and Sport, University of Seville, Seville, Spain
,
Carlos Otero-Esquina
4   Fitness Section, Sevilla Football Club, Seville, Spain
,
Hugo Sanchez
4   Fitness Section, Sevilla Football Club, Seville, Spain
,
Oliver Gonzalo-Skok
5   Faculty of Health Sciences, University of San Jorge, Zaragoza, Spain
› Author Affiliations
Further Information

Publication History



accepted 15 July 2019

Publication Date:
21 August 2019 (online)

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Abstract

The aims of this study were to analyse the effect of chronic strength training over concentric power (CON), eccentric power (ECC), ECC/CON ratio, and 20 m linear sprint performance in elite young soccer players. Twenty young elite Spanish soccer players were assigned to an experimental group (CPG) which performed a front-step exercise using a conical pulley, 2–3 sets of 6 repetitions each leg, during 9 weeks (CPG, n=10) in addition to its usual strength training, or to a control group (CG, n=10). The improvements in the ECC mean power (36%, ES=1.61), and ECC / CON ratio (17%, ES=1.77) were substantially greater in the CPG than in the CG while the CON mean power (16%, ES=0.83) was substantially greater in the CG than in the CPG. The sprinting time for 10 m (2.8%, ES=0.78) and the 10 m flying time between 10–20 m (1.72%, ES=0.41) were substantially enhanced in CPG and CG respectively. To be efficient when defining a functional strength training and performance increments using an inertial device, the mean power output need to be measured during the CON and ECC phases and an analysis of the ECC / CON ratio should be included.

Key words

rotatory inertial device - mean power - sprint performance - force-vector training - resistance training - young soccer players
 

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