La mayoria de estudios demuestran; a) un descenso de la actividad fisica (AF) que coincide con la adolescencia, sobre todo en poblacion femenina, b) durante la primavera y la jornada escolar se realiza mayor AF que durante el invierno o el fin de semana, siendo esta actividad fundamentalmente moderada. El objetivo de este estudio es comparar los niveles de actividad fisica de los adolescentes de dos poblaciones aragonesas (Zaragoza y Sabinanigo). Para ello hemos utilizado el Four by one-day Physical Activity Questionnaire. Los resultados de nuestro estudio senalan que: el gasto energetico total derivado de la practica de actividad fisica, es mayor en la zona rural estudiada; mientras que el gasto energetico derivado de la jornada escolar tanto de invierno como de primavera es mayor en la poblacion urbana estudiada, el gasto energetico derivado del fin de semana tanto de invierno como de primavera es mayor en la poblacion rural; es mayor la actividad fisica realizada por los hombres que por las mujeres solo en el caso de la poblacion urbana estudiada; predominan las actividades ligeras o muy ligeras en ambos sexos y poblaciones; encontramos una relacion significativa entre las horas que ven television y la practica de actividad fisica. Palabras clave / keywords : niveles de actividad fisica | gasto energetico | promocion de la actividad fisica | teenagers | levels of physical activity | energy expenditure | physical activity promotion Abstract Most of studies they demonstrate; a) a reduction of the physical activity (AF) that agrees with the adolescence, mainly in feminine population, b) during the spring and the scholastic day is made greater high frequency than during the winter or the weekend, being this fundamentally moderate activity. The objective of this study is to compare the levels of physical activity of the adolescents of two Aragonese populations (Zaragoza and Sabinanigo). For it we have used the Four by one-day Physical Activity Questionnaire. The results of our study indicate that: the energy expenditure total (kcal/kg/day) derivative of the practice of physical activity, is greater in the studied countryside; whereas the energy expenditure derived from the scholastic day as much of winter as of spring is greater in the studied urban population, the energy expenditure derived from the weekend as much of winter as of spring he is greater in the rural population; the physical activity made by the men is greater who by the women single in the case of the studied urban population; the slight or very slight activities in both sexes and populations predominate; we found a significant relation between the hours that watch television and the high frequency practice. doi:10.5232/ricyde2006.00401 --------------------------------------------------------------------- Referencias/references Ainsworth, B.A., Haskell, WL., Leon, A.S. Jacobs, D.R. Montoye, H.J. Sallis, J.F. et al.(1993). 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