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

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.