Abstract:

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.

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