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Copyright of Retos: Nuevas Perspectivas de Educación Física, Deporte y Recreación is the property of Federacion Espanola de Asociaciones de Docentes de Educacion Fisica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Brasileira de Medicina do Esporte is the property of Redprint Editora Ltda. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Retos: Nuevas Perspectivas de Educación Física, Deporte y Recreación is the property of Federacion Espanola de Asociaciones de Docentes de Educacion Fisica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Retos: Nuevas Perspectivas de Educación Física, Deporte y Recreación is the property of Federacion Espanola de Asociaciones de Docentes de Educacion Fisica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Retos: Nuevas Perspectivas de Educación Física, Deporte y Recreación is the property of Federacion Espanola de Asociaciones de Docentes de Educacion Fisica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The study examined offensive tactical actions performed by U-15 soccer players with different competitive contexts. 34 matches played by three different contexts of U-15 soccer clubs were used; brazilian national (BN), brazilian regional (BR), and italian national (IN). Five categories where used to analyze the soccer offensive actions: "number of players involved" (NJ), "ball touches" (NT), "passes" (NP), "corridor changes" (NTC), and "duration of ball possession" (TRA); the results were coded using Match Vision Studio® software. The BN presented higher values in all five offensive categories (p < 0.05) when compared to the IN. Multinomial regression evidenced relative contributions of NJ and NP on the chances of results in the BN. The increase of one player involved in the offensive action decreases by 84% the chances of "total success" with respect to "unsuccessful" (p < 0.05). The performance of each additional pass increases 4.9 times the chance of the play ending in "total success" and 4.7 times (p < 0.05) in "partial success" when compared to the "unsuccessful" category. The NJ in the action and the NP have a direct influence on the outcome of the offensive actions of the BN. [ABSTRACT FROM AUTHOR]

Purpose. The aim of the study was to analyse the execution efficiency of core tactical principles in young soccer players and compare them among different game positions. Methods. The sample included 54 Brazilian young soccer players. Tactical performance was measured by the System of Tactical Assessment in Soccer with the GR3-3GR test in 3770 tactical actions. Friedman followed by Wilcoxon tests were used to analyse differences between tactical principles. Kruskal-Wallis and Mann-Whitney U tests were performed to compare tactical efficiency between defenders, midfielders, and forwards (p < 0.05). Results. Offensively, the results indicated that young players demonstrated less efficiency in executing the principle 'depth mobility' compared with 'penetration,' 'offensive coverage,' 'width and length,' and 'offensive unity.' Regarding the defensive aspects, 'concentration' was performed more efficiently than other principles. Comparisons between positions proved that midfielders and forwards executed 'offensive unity' more efficiently than defenders. Defenders tended to present high 'defensive coverage' efficiency when compared with 'midfielders.'. Conclusions. High efficiency in the execution of 'concentration' represents an obstacle to make deep passes and hinders offensive movements between the last defender line and goal, given low efficiency of 'depth mobility.' Midfielders and forwards performed 'offensive unity' more efficiently than defenders. As for defensive principles, defenders presented better performance in 'defensive coverage,' giving support to the first defender. In practical applications, it is suggested that coaches of young regional soccer players carry out activities which allow depth passes to teammates as well as games to promote 'offensive unity' for defenders and 'defensive coverage' for midfielders. [ABSTRACT FROM AUTHOR]

Copyright of Brazilian Journal of Soccer Science / Revista Brasileira de Futebol is the property of Revista Brasileira de Futebol and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Brazilian Journal of Soccer Science / Revista Brasileira de Futebol is the property of Revista Brasileira de Futebol and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Brazilian Journal of Soccer Science / Revista Brasileira de Futebol is the property of Revista Brasileira de Futebol and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Brazilian Journal of Soccer Science / Revista Brasileira de Futebol is the property of Revista Brasileira de Futebol and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)