Portal de Periódicos da CAPES

The Effect of Intensity on Heart Rate and Blood Lactate Response to Resistance Exercise

1993; Lippincott Williams & Wilkins; Volume: 7; Issue: 1 Linguagem: Inglês

10.1519/1533-4287(1993)007 2.3.co;2

1533-4287

Ralph Rozenek, Lauren Rosenau, Pat Rosenau, Michael H. Stone,

Heart Rate Variability and Autonomic Control

ABSTRACT The present study compared the effects of two relative intensities on heart rate and blood lactate response to resistance exercise while controlling training variables such as number of sets, number of repetitions, exercise time, and time of recovery. On two occasions 8 male subjects were asked to perform five sets of 10 repetitions (reps) in the bench press at either 50 or 70% of a one-repetition maximum (1-RM). Each set required 20 to 25 seconds to complete. Recovery time between sets was 3 minutes. Mixed factorial analysis of variance revealed an intensity and set dependent effect for heart rate (HR) and blood lactate concentrations (bLA). HR and bLA were significantly higher (p<0.05) following the 70% 1-RM trial as compared to the 50% 1-RM trial. Differences between the 50% and 70% 1-RM trials occurred following the first set of exercise. At 50% 1-RM, HR and bLA leveled off following the first two sets. However, at 70% 1-RM, significantly elevated responses were observed with increasing set number. Results from this study suggest that the bench press exercise is capable of producing significant changes in heart rate and blood lactate concentrations. These changes are affected by the exercise intensity as well as the number of sets employed and should be considered when designing a resistance exercise training program.