Modelling developmental changes in repeated-sprint ability by chronological and skeletal ages in young soccer players - Valente-dos-Santos, J; Coelho e Silva, M J; Martins, R A; Figueiredo, A J; Cyrino, E S; Sherar, L B; Vaeyens, R; Huijgen, BC H; Elferink-Gemser, M T; Malina, R M (Int J Sports Med, 2012)