Changes in physical fitness in elite youth team soccer players, aged 11 and 12 years old over a soccer season - Ryder, J.; Cotterrell, D.; Kellett, D. W.; Lafferty, M.; Brodie, D. A. (The Journal of Physiology, 2002)
Keywords: sport physiology; junior elite sport; performance capacity; soccer; Great Britain; sport games; biological and medical sciences; junior sports