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El objetivo del estudio fue medir y correlacionar la practica de actividad fisica y con el Indice de Ruffier (IR) en adolescentes. A un total de 884 alumnos (edad=16,4±0,8 anos) se les midio la actividad fisica con la Version modificada del Assessment of Physical Activity Level Questionnaire (APALQ) y se evaluo la capacidad de adaptacion al esfuerzo mediante el Test Ruffier. La media del Indice de Ruffier  fue 11,1±4,6 y el Indice de actividad fisica (IAF) 13,8±4,4. Las relaciones entre IAF y el IR, y entre horas de ocio sedentario e IR resultaron ser significativas aunque debiles (r=-0,31;  p =0,000). En el IR los chicos presentaron valores superiores (t= -8,78;  p = 0,000) a las chicas. Tambien destinan mas tiempo a la practica de AF y estas diferencias fueron significativas en AF reglada y no reglada y en participacion en competicion ( p =0,000), mientras que las chicas destinan mas tiempo a actividades sedentarias como leer y estudiar ( p =0,000). Es necesario promover la practica de actividades fisico-deportivas, especialmente entre las chicas. PALABRAS CLAVE : actividad fisica, adolescentes, condicion fisica, actividad sedentaria. ABSTRACT The aim of the study was to assess and correlate physical activity practice and fitness level in adolescents. A total of 884 students (age=16,4±0,8 years) answered the modified version of the “Assessment of Physical Activity Level Questionnaire (APALQ)” and aerobic capacity was assessed through the Ruffier Test. The mean Ruffier Index (IR) was 11,1±4,6 and the mean Physical Activity Index (IAF) was 13,8±4,4. The relationship between IAF and IR, and between sedentary activities in leisure time and IR, was significant (r=-0,31;  p =0,000). although weak. Boys showed higher physical fitness values (t= -8,78;  p = 0,000) and spent more time practicing physical activity. These differences were significant for both regulated and not regulated physical activity and for participation in competition (p=0.000). Girls spent more time in sedentary activities like reading and studying (p=0.000). It is necessary to promote physical activity and sport practice, especially among girls. KEY WORDS : physical activity, adolescents, fitness level, sedentary behavior.

revista internacional de medicina y ciencias de la actividad física y del deporte

Actividad física y ocio y su relación con el índice de Ruffier en adolescentes / Physical Activity And Leisure Habits And Relation With Ruffier Index In Adolescents pp. 165-180