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El objetivo de este estudio fue comparar las demandas fisicas que exigen dos modalidades de juego distintas en futbol a jugadores jovenes (Futbol 7 (F7) vs. Futbol 11 (F11)). 26 sujetos de entre 12 y 15 anos fueron valorados durante la primera parte de 8 partidos (4 de F7 y 4 de F11). Los datos se midieron con GPS de 1 Hz. Los principales resultados fueron: 1) el rendimiento de carrera fue superior (en terminos absolutos) cuanto mayor edad, tanto en F7 como en F11, 2) en general, para el mismo grupo de edad, el F11 supuso mayor demanda fisica que el F7, 3) en la misma categoria, hubo mayor demanda fisica en el grupo de mayor nivel (solo en F11). En sintesis, los resultados mostraron una mayor demanda fisica del F11 frente al F7 en la mayoria de las comparaciones realizadas. Dicha demanda de carrera tambien aumento conforme lo hacia la categoria segun la edad, sobre todo se encontraron diferencias entre Infantil B (infantiles de primer ano en la categoria) y Alevin. Todo esto podria indicar que el cambio de superficie de juego que se da al pasar de categoria alevin a categoria infantil (y por tanto, de F7 a F11) podria ser demasiado drastico, ya que en muy pocos meses los jugadores cambian de categoria. Por tanto, hemos llegado a la conclusion de que podria ser conveniente establecer un terreno de juego de dimensiones intermedias entre F7 y F11 en la categoria infantil que haga el cambio de dimensiones mas progresivo. Palabras Clave : futbol, futbol 7, demandas de carrera, GPS, jovenes. Abstract: The aim of this study is to compare the running requirements of playing football in two different modes with youth players (Football 7 (F7) vs. Football 11 (F11)). 26 individuals (12-15 years old) were measured during the first half of 8 matches (4 of F7 and 4 of F11). Data was collected with 1 Hz GPS. The main results were: 1) running performance was higher (in absolute terms) in the oldest players, both in F7 and F11, 2) generally, within the same age group, F11 was physically more demanding than F7, 3) within the same category, the highest level group obtained the greatest physical exertion (only F11). To sum up, results showed that F11 necessitated greater physical exertion than F7 in the majority of comparisons. This running demands also rose according the age and, above all, differences were found between «Infantil B» (under-13, playing F11 according to the rules for the first time) and «Alevin» (under-12). These discoveries may indicate that the change of the dimensions of the pitch from «Alevin» to «Infantil» (therefore, from F7 size to F11 size) may be too drastic because players change from one category to the other in only a few months. We therefore suggest that it may be convenient for the «Infantil» players (under-13 and under-14) to establish a pitch with intermediate dimensions between F7 size and F11 size. This would make the step from one size to the other more progressive in terms of physical exertion. Keywords : football, football 7, running requirements, GPS, youth players.

retos digital/retos

Comparación de las demandas de carrera Futbol 7 vs. Fútbol 11 en jugadores jóvenes de fútbol (Running requirements comparison between Football 7 and Football 11 with youth soccer players)