ABSTRACT
Sprint ability is generally accepted as an essential element in modern soccer. Many previous studies indicate that sprint ability over short distances serves as a discriminator for higher level performance in young soccer players (Reilly, et al., 2000; Vaeyens, et al, 2006; Gil, et al, 2007). Philippaerts, et al. (2006) have shown that maximal development in running speed in soccer players at puberty occurs coincidently with the peak growth velocity in height. Mendez-Villanueva, et al. (2011) suggested that development of fat-free mass could be a factor related to faster sprinting in post-pubertal soccer players. Therefore, information that correlates sprinting to physical development in young soccer players is important for designing effective training at this age. Despite many studies on improving sprinting in young soccer players there is little longitudinal data which enables us to examine speed development directly with physical development. In this study we investigated longitudinal changes in 20 m sprint times as well as anthropometric and fitness profiles of U-14 players for two consecutive years. The purpose of the study is to identify the particular anthropometric and fitness characteristics relating to sprint development in players during early adolescence. Towards that end, the first approach taken was to examine correlations between sprint speed and variables relating to anthropometry and fitness. The second approach taken was to compare the magnitude of developments in physique and fitness between players showing different improvements in sprinting during those two years.
