RESUMEN
This study aimed to compare soccer players' tactical performance according to their positional roles in the field test of FUT-SAT. The sample consisted of 54 male players from elite youth clubs (Medellín-Colombia), U16 and U17 categories. Participants trained five times per week (Tier 3). We used the System of Tactical Assessment (FUT-SAT), which evaluates tactical behaviour and performance through core tactical principles of soccer. The field test is structured in a numerical configuration of a goalkeeper + 3 players vs. 3 players + a goalkeeper played during 4 min on a playing field 36 m long by 27 m wide. All teams were structured with one player in each positional role (one defender, one midfielder, and one forward).To determine the differences between the positional roles, the following factors were analysed: the number of actions, the percentage of correct actions, the place of action related to the principles, and the Tactical Performance Index of core tactical principles. A total of 2891 tactical actions distributed in nine games were analysed. A Kruskal-Wallis test for the independent groups (defenders, midfielders, and forwards) or a one-way ANOVA was used. There was no difference in soccer players' tactical performance and behaviour between players of different positional roles in the field test of FUT-SAT.Therefore, teams need to be evaluated with the system of play with players in all field sectors in medium or large sided games. The system of play can be chosen according to the category given that competitions are held in reduced spaces and with fewer players.
RESUMEN
The aim of this study was to verify the effect of an inside floater on soccer players' tactical behaviour in small-sided and conditioned games (SSCGs). The sample comprised 54 Brazilian top-level academy players. The instrument used to assess players' tactical behaviour was the System of Tactical Assessment in Soccer (FUT-SAT). Tactical behaviour was analysed through the number of tactical actions and the percentage of correct actions regarding the core tactical principles of soccer. Repeated measures test was used to compare tactical behaviour between games (SSCGs) with and without an inside floater. Pearson's r was used to verify the effect size of the inside floater on tactical behaviour. As for tactical actions, SSCGs with an inside floater displayed significantly lower means for the tactical principles of penetration (2.76 ± 1.63; p < .001), delay (6.11 ± 2.68; p < .018), defensive coverage (1.64 ± 1.14; p < .001) and significantly higher means for the tactical principle of defensive unity (14.98 ± 4.57; p < .032). With respect to the percentage of correct actions, SSCGs with an inside floater displayed significantly lower means for all tactical principles, except for offensive coverage (90.5 ± 18.48; p < 1.000). It was concluded that the inside floater allowed players to modify their behaviour in such a way that they adapted to the constraints imposed by the presence of an inside floater. Furthermore, the inside floater provided more difficulty for players, and thus may be considered an important task constraint to be added in SSCGs.
RESUMEN
The purpose of this study was to verify the date of birth is a decisive factor for the success of players selected by the coaches to participate in the FIFA U-17 World Cup Emirates 2013. The players' date of birth were classified into four quartiles of three months each (Q1 to Q4). In the qualifying round, 46.5% of the selected players born in Q1, while 12.5% in Q4. This significantly different distribution occurred until the semi-finals. However, in the final match, there were no significant differences between Q1 and Q4. A similar relative age effect also occurred when analyzed only players who actually participated to the matches. Interestingly, despite there was birth date effect on performance in all World Cup stages except in the final, other issues should take into consideration for a team became champion.
O objetivo deste estudo foi verificar se a data de nascimento é um fator decisivo para o sucesso de jogadores selecionados pelos treinadores para participar da Copa do Mundo Sub-17 Emirates 2013. As datas de nascimento dos jogadores foram classificadas em quatro quartis de três meses de cada (Q1 a Q4). Na qualificação, 46,5% dos jogadores selecionados nasceram em Q1, enquanto 12,5% em Q4. Esta distribuição significativamente diferente ocorreu até às semifinais. Entretanto, na final, não houve diferenças significativas entre Q1 e Q4. Um efeito similar da idade relativa também ocorreu quando analisados apenas os jogadores que efetivamente participaram das partidas. Curiosamente, apesar de haver efeito da data de nascimento sobre o desempenho em toda Copa do Mundo, exceto na final, outras questões devem levadas em consideração para uma equipe sagrar-se campeã.
La finalidad de este estudio fue verificar la fecha de nacimiento es un factor decisivo para el éxito de los jugadores seleccionados por los entrenadores para participar de la Copa Mundial sub-17 FIFA Emirados Árabes Unidos 2013. Fecha de nacimiento se clasificaron en cuatro cuartiles de tres meses (Q1 a Q4). En la qualificación, 46,5% de los seleccionados nacieron en Q1, mientras 12,5% en Q4. Esta distribución diferente ocurrió hasta las semifinales. Sin embargo, en la final, no hubo diferencias entre Q1 y Q4. Un efecto similar también ocurrió cuando se analizaron sólo los jugadores que efectivamente hugaron. Curiosamente, mismo con efecto de la fecha de nacimiento en toda la Copa Mundial, excepto la final, otros temas deben tener en cuenta para un equipo hacerse campeón.
