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El objetivo de este trabajo fue determinar la influencia de un programa de actividad fisica extraescolar convencional de 12 semanas de duracion sobre la condicion fisica en adolescentes. Se seleccionaron un total de 46 estudiantes chilenos sanos (22 chicos y 24 chicas) (13,95±0,70 anos; 53,91±7,33 kg; 1,63±0,15 m) que no realizaban actividad fisica fuera del horario escolar. Se llevo a cabo una valoracion antropometrica, fuerza isometrica manual, salto horizontal, flexibilidad isquiosural, test 4x10m, test de CAFRA y test de balance “Y”, antes y despues de un programa de actividad fisica de 12 semanas de duracion, 3 veces por semana y 60 minutos por sesion. Los resultados muestran que existen mejoras a nivel cardiovascular, salto de longitud y equilibrio dinamico; obteniendo valores mas bajos en flexibilidad. A su vez, el genero masculino mejora estadisticamente en salto horizontal y equilibrio dinamico; mientras que el genero femenino lo hace, ademas, a nivel cardiovascular. Se pone de manifiesto la necesidad de evaluar programas de actividad fisica extraescolares convencionales en poblacion joven y sana. Abstract. The aim of this study was to determine the influence of a 12-week conventional physical activity program on the physical fitness of a group of adolescents. A total of 46 healthy Chilean students (22 boys and 24 girls) (13.95 ± 0.70 years, 53.91 ± 7.33 kg, 1.63 ± 0.15 m) who did not use to perform physical activity out of the school schedule were selected. Anthropometric assessment, hand grip, horizontal jump, hamstring flexibility, 4x10m test, CAFRA test and "Y" balance test were performed before and after a 12-week physical activity program characterized by 3 60-minute sessions per week. The results showed improvements in cardiovascular level, horizontal jump, and dynamic balance; however, lower values were found for flexibility. Boys improved statistically in horizontal jump and dynamic equilibrium; whereas girls gained also at the cardiovascular level. The need to evaluate conventional extracurricular physical activity programs in young and healthy populations is evident.

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Efecto de un programa de actividades deportivas extraescolares en jóvenes chilenos (Effect of an extracurricular sport activity program on young Chileans)