The effects of different velocity loss training protocols after 3 weeks of resistance training on muscular strength and power

BACKGROUND: The evidence of response to velocity loss cut-off training with similar total repetitions are limited. OBJECTIVE: This study aimed to examine the effects of different velocity loss training protocols after 3 weeks of traditional resistance training protocols on strength and power in trained men. METHODS: Twenty highly trained men participated in the study. The protocols were performed twice a week for 6-weeks, with the first 3-weeks consisting of traditional (TR) training protocols and the other 3-weeks of velocity loss (VL) training protocols. The TR and VL training protocols consisted of 80% 1RM of full squat exercise with 4-min rest intervals. The participants were randomly assigned to two different protocols during the VL training protocols, each with different velocity loss within sets (V20%; n = 10 or VL40%; n = 10). The number of sets was adjusted so that the total number of repetitions for each VL was similar (VL20 × 3 sets, VL40 × 2 sets). Measurements assessed using one-repetition maximum (1RM), isokinetic strength, 20 m-sprint (T20), and counter movement jump (CMJ). RESULTS: The total number of repetitions in the session significantly decreased from the TR training protocol to the VL training protocol in each group (TR to VL20; - 18%, TR to VL40; - 27%, p < 0.05). There was no significant difference of repetitions between groups. The T20 and isokinetic strength changed significantly in both groups after 6-weeks of training. CONCLUSION: The VL training protocol with reduced volume following the TR training protocol has been shown to maintain and increase strength and power outcomes. However, no significant difference in training response was observed between VL20 and VL40 protocols. The combination of TR and VL protocols might be an effective strategy for optimizing athletic performance.