Investigação das respostas agudas do consumo de oxigênio e da frequência cardíaca nos exercícios aeróbio e de força, em homens jovens treinados

The aim of this study was to investigate oxygen uptake (VO2) and heart rate (HR) acute responses during aerobic and strength exercises in trained men. Participated 10 volunteers, age 23.90 ± 3.62 years, they were submitted to the tests maximum cardiopulmonary exercise test in treadmill, with determination of maximal oxygen uptake (VO2max) and ventilatory threshold (VT), and 1-repetition maximum (1RM) in bench press, squat and standing barbell curls; and two cardiopulmonary submaximal tests in aerobic exercise (running at VT) and strength (exercises of 1RM test, 3 sets of 8 to 12 repetitions, the first to warm-up and followed by 3 sets at 70% of 1RM); the submaximal tests were realized in two different days; in one of them the volunteers started with the aerobic exercise and after that, the strength exercise (AE-SE), and on another day started with strength exercise, followed by aerobic exercise (SE-AE). The results of VO2 and HR didn’t show significant differences in AE-SE and SE-AE. The VO2 in aerobic exercises hasn’t showed significant difference from VO2TH and was bigger than 46% VO2max; the HR in aerobic exercises hasn’t showed significant difference from HRVT and was bigger than 64% HRmax. The VO2 in strength exercises was smaller than VO2VT and 46% VO2max, and the HR was smaller than HRTH and bigger than 64% HRmax. It was concluded that the VT was an adequate intensity to cardiorespiratory fitness training, and aerobic overload in strength exercise was low.