Efeito da amplitude de movimento no número máximo de repetições em exercícios de musculação

Abstract

Introduction: The resistance training volume can be measured by the amount of work (joules) over a given period of time. In a less restricted sense, it can still be estimated by the sum of the number of repetitions or the number of sets performed. Objectives: To evaluate the effect of range of motion on the maximum number of repetitions in scott bench, squat and bench press exercises and to verify if the use of the metronome is sufficient to control the speed of execution in these exercises. Methods: The tests consisted of four volunteer visits to the laboratory, on different dates, with at least 48 hours without training. Maximum strength tests (1-RM) and maximum repetition tests (TRM) were performed, with 70% of 1-RM, in the squat, bench press and curl exercises on the Scott bench, at full and partial range of motion. The range of motion and speed of the movements were controlled by means of a visual feedback device and the aid of a metronome. Hypothesis tests were applied to verify the differences between the exercises and between the range of motion. Results: Analyzing the data, it was obtained significant differences in the maximum number of repetitions in different ranges of motion with the same relative percentage of 1-RM in all exercises proposed by the study. Partial range of motion, presented a -8.58 and 16.66%, respectively, of variation in relation to the time target established for the execution of the movements. Conclusions: Based on the data presented, it can be concluded that the range of motion interferes with the number of repetitions performed in the bench press, squat and bench press exercises, and larger amplitudes cause reductions in the number of repetitions. Further studies are needed to evaluate the effectiveness of the metronome as a speed control tool in bodybuilding exercises.