Relationships between isokinetic knee strength, sprint and jump performance in young elite soccer players M. BUZEK AND T. GRYC
The ability to perform high-speed running actions during a game is an important prerequisite for successful participation in soccer (Reilly et al., 2000). According to Stølen et al. (2005) during a game, a sprint bout occurs approximately every 90s, each lasting an average of 2-4s. Sprinting constitutes 111% of the total distance covered during a game (Mohr et al., 2003). The activity profile of an elite Italian soccer team revealed that 75.8% of high intensity sprinting (>19km.h-1) is within the distance of 9m (Vigne et al., 2010). Therefore, it is essential to investigate the relationships between the determining prerequisites for optimal player’s performance followed by its transfer to sports training. Botek et al. (2010) state, that the traditional model of soccer training during the preparation phase (5 weeks, 35 training units, 13 primarily focused on development of strength and 11 on aerobic endurance development) does not lead to the desired changes in conditioning and somatic parameters in U18 soccer players. The aim of the study was to examine the relationships between knee extensors and flexors strength, linear sprint performance and jump performance in elite youth soccer players.