RESUMEN Introduccion: Los bomberos aeronauticos atienden las emergencias en aeropuertos y sus cercanias. Su trabajo implica actividades de baja intensidad por periodos largos y, durante emergencias, actividades de alta intensidad, por lo cual es necesario que tengan buena condicion fisica. Objetivo: Determinar la capacidad aerobica de los bomberos aeronauticos y sus factores determinantes. Materiales y Metodos: Estudio descriptivo transversal, en una muestra de 23 hombres bomberos aeronauticos. Se determino el consumo maximo de oxigeno (VO max) y umbral ventilatorio mediante ergo-espirometria (FitMate® Pro) durante un protocolo maximo sobre tapiz rodante. Se evaluo la composicion corporal mediante adipometria. Se determino el nivel de actividad fisica mediante el cuestionario internacional de actividad fisica IPAQ corto. Resultados y Discusion: El VO2 max fue 44,6±6,0 ml/kg/min y el umbral ventilatorio fue 40±11%. 48% de los sujetos realizaban actividad fisica moderada y 52% actividad fisica intensa. El VO max se correlaciono con la actividad fisica (r=0,72; p=0.000), y a su vez esta con el porcentaje de grasa corporal (r= -0.46; p=0,027) e IMC (r= -0,43; p=0,039). Aunque 17 de 23 sujetos tenian IMC igual o superior a 25 kg/m su grasa corporal se encontraba entre 12,5 y 22,8%. Conclusion: Aunque el VO max se encontro en buen nivel, por el tipo de tareas que los bomberos deben desarrollar durante la atencion de emergencias, se sugiere mejorar el umbral anaerobico, mediante entrenamiento de intervalos de alta intensidad. En bomberos, el IMC no parece ser adecuado para valorar riesgo cardiovascular, por lo que se sugiere utilizar el porcentaje de grasa corporal. Palabras clave: bomberos, consumo de oxigeno, umbral anaerobio, salud laboral (Decs). ABSTRACT Introduction: Aeronautical firefighters manage emergencies at airports and nearby. Their work involves low-intensity activities for long periods and, in emergencies high intensity activities that require good physical condition. Objective: To determine the aerobic capacity of aeronautical firefighters and its determinant factors. Methods: Cross sectional study in 23 male aeronautical firefighters. Maximum oxygen consumption (VOmax) and ventilatory threshold was determined by ergospirometry (FitMate® Pro) during a maximum protocol on treadmill. Body composition was assessed by adipometry. Physical activity level was determined with the international physical activity questionnaire (IPAQ) short version. Results and Discussion:VO 2 max was 44.6 ± 6.0 ml/kg/min and ventilatory threshold was 4± 11%. 48% of subjects were classified withmoderate physical activity and 52% with vigorous. VOmax was correlated with physical activity (r = 0.72p = 0.000), and the last with the percentage of body fat (r = -0.46; p = 0.027) and body mass index (BMI) (r = -0.43;p = 0.039). Although 17 of 23 subjects had IMC≥25 kg /m 2, body fat was between 12.5 and 22.8%. Conclusion:Although VO22cmax was found in good level; because of the kind of tasks that firefighters develop during emergencycattention, it is suggested to improve anaerobic threshold with high intensity intervals training. Among firefighters, BMI does not seem to be adequate to assess cardiovascular risk, and implementation of percentage of body fat is recommended.