Effect of Movement Range in Maximum Number of Repetitions in Weight Training Exercises

Volume in resistance training can be estimated by the sum of the number of repetitions or number of series performed.To evaluate the effect of movement amplitude on maximum number of repetitions in exercises on preacher curl, squat bench press and verifying if the use of the metronome is adequate to control speed of execution in these exercises.Tests consisted of four visits by volunteers to the laboratory, on different dates, with an interval of at least 48 hours without training.One-repetition Maximum (1-RM) and maximum repetitions test (MRT) were performed, with 70% of 1-RM.Amplitudes and speed of movements were controlled by means of a visual feedback device and aid of a metronome.By analyzing data significant differences were obtained in maximum number of repetitions in different motion amplitudes with same relative percentage of 1-RM in all exercises proposed by study.Squat exercises with total amplitude and exercises on the preacher curl with partial amplitude, presented a variation of -8.58 and 16.66%, respectively, in relation to time target established for performing movements.It can be concluded that movement amplitude interferes in the number of repetitions performed, where larger amplitudes cause reductions in the number of repetitions.