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Los objetivos de este trabajo fueron: a) analizar la relacion entre las variables antropometricas, edad cronologica, maduracion somatica y flujo espiratorio maximo con la Masa libre de grasa (MLG) de jovenes nadadores y b) proponer ecuaciones de regresion que permitan predecir la MLG de nadadores por edad biologica y sexo. Se estudio a 36 nadadores (21 hombres y 15 mujeres) entre los 10.0 a 16.9 anos, de la seleccion de Natacion del Maule (Chile). Se evaluo el peso, estatura, estatura sentada, longitud del antebrazo, circunferencia de la pantorrilla y el Flujo espiratorio Maximo (FEM). Se calculo la edad cronologica y edad biologica por antropometria. Se obtuvo los valores de la composicion corporal (MLG, Masa osea y masa grasa) por medio de la Absorciometria dual de rayos X (DXA). La MLG se relaciono con la edad cronologica (R 2 = 0.46), biologica (R 2 = 0.69), Peso (R 2 = 0.86), estatura (R 2 = 0.77), estatura sentada (R 2 = 0.66) longitud del antebrazo (R 2 = 0.69), circunferencia del brazo derecho (R 2 = 0.55) y FEM (R 2 = 0.69). Se generaron cuatro ecuaciones de regresion para cada sexo las que evidenciaron un R 2 Ajustado entre 86 a 90% en hombres y en mujeres entre 95 a 97%. La edad biologica, la longitud del antebrazo, la circunferencia de la pantorrilla y el FEM son excelentes predictores de la MLG. Las ecuaciones generadas sirven para controlar, diagnosticar, monitorizar la MLG de los jovenes nadadores por edad biologica y sexo. Abstract. The objectives of this work were: a) to analyze the relationship between anthropometric variables, chronological age, somatic maturation and maximum expiratory flow with Fat Free Mass (MLG) of young swimmers and b) propose regression equations that allow to predict MLG of swimmers by biological age and sex. We studied 36 swimmers (21 men and 15 women) between 10.0 and 16.9 years old, from the selection of Maule Swimming (Chile). Weight, height, sitting height, forearm length, calf circumference and Maximum Expiratory Flow (FEM) were evaluated. Chronological age and biological age were calculated by anthropometry. The values of body composition (MLG, Bone Mass and fat mass) were obtained by means of Dual X-ray Absorptiometry (DXA). MLG was related to chronological age (R 2 = 0.46), biological age (R 2 = 0.69), weight (R 2 = 0.86), height (R 2 = 0.77), sitting height (R 2 = 0.66) forearm length (R 2 = 0.69), circumference of the right arm (R 2 = 0.55) and FEM (R 2 = 0.69). Four regression equations were generated for each sex, which showed an adjusted R 2 between 86% and 90% in men, and in women between 95% and 97%. The biological age, the length of the forearm, the circumference of the calf and the FEM are excellent predictors of MLG. The generated equations serve to control, diagnose, and monitor the MLG of young swimmers by biological age and sex.

retos digital/retos

Variables antropométricas, maduración somática y flujo espiratorio: determinantes de la masa libre de grasa en jóvenes nadadores (Anthropometric variables, somatic maturation and expiratory flow: determinants of fat-free mass in young swimmers)