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RESUMEN Objetivo: Comparar las respuestas respiratorias, de frecuencia cardiaca (FC) y lactato a intensidad de umbral lactico (UL) en media sentadilla (MS) vs cicloergometro. Metodos: 24 hombres (21,5±1,8 anos, 180,1±5,2 cm, 81,9±8,7 kg) con experiencia en el entrenamiento de fuerza realizaron un test incremental progresivo en MS y cicloergometro para determinar el UL. Durante los test se midieron las concentraciones de lactato, FC, consumo de oxigeno (VO2), produccion de dioxido de carbono (VCO2), ventilacion pulmonar (VE), equivalente ventilatorio del oxigeno (VE·VO2-1) y del dioxido de carbono (VE·VCO2-1). Una t student valoro las diferencias entre las dos modalidades de ejercicio. Resultados: las concentraciones de lactato, FC, VE, VE·VCO2-1 y VE·VO2-1 fueron superiores en MS vs cicloergometro (p<0,05). Conclusiones: el UL puede ser detectado en el ejercicio de MS. Ademas, la realizacion de sesiones de entrenamiento contrarresistencias, a intensidad de UL, podrian ser utilizadas para mejorar la resistencia cardiovascular y la fuerza muscular.PALABRAS CLAVE: resistencia, fuerza, entrenamiento contrarresistencias, umbral anaerobico, transicion aerobica-anaerobica ABSTRACT  Objective: To compare respiratory responses, heart rate (HR) and lactate at the intensity of the lactate threshold (LT) between half squat (HS) and cycloergometer. Methods: 24 men (21.5±1.8 years, 180.1 ± 5.2 cm, 81.9±8.7 kg) with experience in resitance performed a progressive incremental test in HS and cycloergometer to determine LT. During such test, the following parameters were measured: blood lactate concentrations, HR, oxygen consumption (VO2), carbon dioxide production (VCO2), pulmonary ventilation (PV), ventilatory equivalent of oxygen (PV·VO2-1) and ventilatory equivalent of carbon dioxide (PV·VCO2-1). A t student evaluated the variables analysed among the two exercise modalities. Results: blood lactate concentrations, HR, PV, and PV·VO2-1 and PV·VCO2-1 were higher in HS than in cycloergometer (p <0.05). Conclusions: LT can be detected in HS exercise. Furthermore, the resistance training sessions to the intensity of LT might be used in training sessions which seek to improve cardiovascular endurance and muscle strength. KEYWORDS: endurance, strength, against-resistance training, anaerobic threshold, aerobic-anaerobic transition

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

RESPUESTAS CARDIORRESPIRATORIAS A INTENSIDAD UMBRAL. ESTUDIO COMPARATIVO ENTRE MEDIA SENTADILLA Y CICLOERGÓMETRO // CARDIORRESPIRATORY RESPONSES AT THRESHOLD INTENSITY. COMPARATIVE BETWEEN HALF SQUAT VS CYCLE ERGOMETER