Muscle strength was evaluated with a REV9000 isokinetic dynamometer. One hundred and fifty nine senior male professional soccer players from first (n = 75) and second league (n = 84) Portuguese clubs participated in this study. The study aimed to investigate and compare the muscle strength imbalances of professional soccer players of different performance levels. Strength imbalances between the hamstrings and quadriceps are an essential predictor for hamstring strain in soccer. We compare our results with the classical analysis of sport ranking based on measures of competitive balance.Įvaluating injury risk in first and second league professional Portuguese soccer: muscular strength and asymmetry.Ĭarvalho, Alberto Brown, Scott Abade, Eduardo We apply this technique to analyze the four major European soccer leagues: Bundesliga, Italian Lega, Spanish Liga, and Premier League. We also show how to make a dynamic analysis of a league and how to compare different leagues. We give a generalization of the Kendall's correlation coefficient to more than two rankings. These structural properties are the mean degree, the mean strength, and the clustering coefficient. We show how to use some structural properties of this competitivity graph to measure to what extend the teams in a league compete. This allows to define a graph by linking teams that compete. We consider that two teams compete when they change their relative positions in consecutive rankings. In particular, we focus on sports rankings and, more precisely, on soccer leagues. ![]() In this paper, we show a new technique to analyze families of rankings. A new method for comparing rankings through complex networks: Model and analysis of competitiveness of major European soccer leaguesĬriado, Regino GarcÃa, Esther Pedroche, Francisco Romance, Miguel
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