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espanolSustituir el tiempo sedentario por la practica sistematica de actividad fisica (AF) es uno de los grandes retos educativos y sociales dirigidos a jovenes con sobrepeso-obesidad. El objetivo principal fue analizar el efecto en el indice de masa corporal (IMC) de un programa de AF extraescolar que empleo el pulsometro como mecanismo para cuantificar el volumen e intensidad del ejercicio. Participaron 69 escolares con sobrepeso-obesidad de 9 a 12 anos. La muestra se aleatorizo en grupo con programa y pulsometro (GE1, n=23), grupo con solo programa (GE2, n=23), y grupo control que no realizo programa ni empleo pulsometro (GC, n=23). Los resultados mostraron que GE1 habia disminuido el IMC respecto al GC a los dos y tres meses de intervencion (-1.65 kg/m2; p=.037, d de Cohen=.786; y -2.02 kg/m2, p=.006, d de Cohen=.895, respectivamente). GE1 incremento significativamente el tiempo diario de intensidad maxima de AF medida por el pulsometro (p=.028). El 86.9% y el 60.8% de los alumnos del GE1 y GE2 respectivamente afirmaron estar bastante o totalmente de acuerdo con el item «He comprobado que realizo mas actividad fisica diaria que antes». La mayoria de ninos y padres del GE1 consideraron la experiencia como positiva y motivante para realizar mas AF. Se concluye que un programa dirigido desde la Educacion Fisica, que combina AF extraescolar y emplea el pulsometro como mecanismo de control, disminuye el IMC en jovenes con sobrepeso-obesidad despues de dos meses de aplicacion, aumenta la motivacion por la practica fisico-deportiva, e implica cambios positivos en los habitos de salud familiar. EnglishReplacing sedentary time with systematic practice of PA is one of the major social and health challenges of globalized world. The main aim of this research was to analyze the effect of a program based on extracurricular PA, using heart rate monitor to quantify the volume and intensity of PA, on the body mass index (BMI). 69 young students with overweight-obesity aged nine to 12 years participated in this study. The sample was randomly split in two groups: PA program and heart rate monitor (EG1, n=23), PA program without heart rate monitor (EG2, n=23), and control group, whose members did not carry out any program nor used any heart rate monitor (CG, n=23). Results showed that GE1 decreased BMI more than CG after two and three months of intervention (-1.65 kg/m2; p=.037, Cohen’s d=.786; y -2.02 kg/m2, p=.006, Cohen’s d =.895, respectively). G1 significantly increased the daily time of PA at maximum intensity measured by the heart rate monitor (p=.028). 86.9% and 60.8% of students in EG1 and EG2 respectively, were quite or totally in agreement with the item «I have verified that I carry out more physical activity daily than before». The majority of children and parents in EG1 considered the experience as positive and motivating to practice more PA. A program focused on Physical Education and combining extracurricular PA and heart rate monitor as a control mechanism, decreases BMI in overweight-obese young students after two months of application, increases motivation towards PA and sport practice, and implies positive changes in family health habits.

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Efecto y satisfacción de un programa de actividad física controlada por pulsómetro en el índice de masa corporal de escolares con sobrepeso-obesidad (Effect of and satisfaction with a program of physical activity controlled through heart rate monitors on