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The Effect of age on the collective behabior of football players in small-sided games.

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Resumo:The main goal of this study was to analyze how the offensive and defensive collective behaviors performed in six-­‐a-­‐side game (GK+5 v.5+GK)vary according to the age and expertise level of young football players (U16,U17 and U19). For this purpose, four measures of collective performance (surface area, stretch index, length and width of a team) have been analyzed. Thirty-­‐six male young football players of three age groups participated in the study (U16-­‐playing experience: 6 ± 1,76 yrs; U17 -­‐7 ± 1,4 yrs; U19 -­‐ 8,7 ± 2,8 yrs). Each group was divided in two balanced teams, which played during 8 mins, with field dimensions of 33m x 60m (165m2 per player). Ten GPS units (GPSports systems SPI PRO) were used to collect the 2D movement displacement trajectories of players. MATLAB software was used to calculate specific team’s behaviors. Sample entropy (SampEn) analysis demonstrated that the regularity of variation of surface area and team width in offensive phase and team length and width in defensive phase varied significantly according to the players’ age and expertize. Pearson correlation coefficients (r) suggest that players’ dispersion, measured by surface area and stretch index, was strongly and negatively correlated in attack and defense. Our findings demonstrated that the age and expertise level of players influence their collective behavior in SSGs. It was concluded that compound positional variables might be considered as a valuable tool to understand the teams’ behavior in offensive and defensive phases of small-­‐sided games.
Autores principais:Barnabé, Luís Manuel Borralho Mendes
Assunto:Association football Compound positional variables Expertise GPS Sample entropy Small-sided games Young football players Entropia amostral Jogos reduzidos Jovens jogadores de futebol Variáveis posicionais compostas
Ano:2013
País:Portugal
Tipo de documento:dissertação de mestrado
Tipo de acesso:acesso aberto
Instituição associada:Universidade de Lisboa
Idioma:inglês
Origem:Repositório da Universidade de Lisboa

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