title: Physical growth and changes in intermittent endurance run performance in young male Basque soccer players.
abstract: The present 4-year longitudinal study examined physical growth and development of intermittent endurance run performance in young Basque soccer players aged 10-15 years applying multilevel regression modeling. Anthropometry, predicted adult stature and Yo-Yo Intermittent Recovery level 1 test (Yo-Yo IR1) of players from the under-11 teams from the Athletic Club of Bilbao were measured at pre- and end-season (two measurements per year of study, n = 33 considered for analysis). A non-linear effect of age on intermittent endurance run was observed, with significantly higher increases in Yo-Yo IR1 between 10-11 year-old and 14-15 year-old players. The development of Yo-Yo IR1 performance in all the years of the study was influenced positively by training exposure during the seasons (P < 0.01) and independent of maturity status and body size (P > 0.05). The steady development of intermittent endurance run performance during pubertal years in adolescent Basque soccer players is partially influenced by training exposure.
authors.affiliation: a Faculty of Sport Sciences and Physical Education , University of Coimbra , Portugal.
authors.forename: Humberto M
authors.initials: HM
authors.lastname: Carvalho
authors.forename: Iraia
authors.initials: I
authors.lastname: Bidaurrazaga-Letona
authors.forename: José António
authors.initials: JA
authors.lastname: Lekue
authors.forename: Markos
authors.initials: M
authors.lastname: Amado
authors.forename: António J
authors.initials: AJ
authors.lastname: Figueiredo
authors.forename: Susana M
authors.initials: SM
authors.lastname: Gil
mesh_terms: D000293:Adolescent; D001827:Body Height / Q000502:physiology; D015992:Body Mass Index; D002648:Child; D006128:Growth / Q000502:physiology*; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D010807:Physical Endurance / Q000502:physiology*; D011627:Puberty / Q000502:physiology; D012916:Soccer / Q000502:physiology*; D013030:Spain
keywords: Yo-Yo intermittent recovery test; adolescent; athlete; maturation; multilevel regression models