Accuracy and reliability of perception bar velocity loss as a subjective method for autoregulation in resistance training
Keywords:velocity-based training, back-squat, bench-press, velocity loss threshold, resistance training.
This study analyzed the accuracy and reliability of the perception of velocity loss as a method to autoregulate the repetitions intra-set using a moderate velocity loss threshold (15-30%). Twenty-two healthy men with resistance training experience (age 28.0 ± 4.3 years, body mass 85.8 ± 8.2 kg) completed a familiarization session to perform exercises with maximal intentional velocity during the concentric phase. After assessing the load-velocity profile in a second session, subjects were familiarized with the perception of velocity loss in a third session. Test-retest procedures were performed in two sessions one week apart, in which participants completed three sets of back-squat and bench press exercises at 40%, 60%, and 80% 1RM. Participants stopped the sets when reaching a moderate velocity loss threshold (15-30%) using their perception of velocity loss. A linear encoder recorded the mean propulsive velocity of the bar in all sessions. Accuracy and reliability were assessed through the deviation of mean values and the lower and upper limits of the confidence interval about the pre-established velocity loss range (15-30%). The PVL method showed acceptable accuracy in the test, which improved the retest for both exercises and intensities. For the test-retest reliability, similar values of percentage velocity loss were observed in the comparison between most series during test and retest (p>0.05). These results support the subjective method's accuracy and reliability based on the perception of velocity loss for autoregulation of intra-set repetitions with a moderate velocity loss threshold.
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