Orange Samuel T, Metcalfe James W, Robinson Ashley, Applegarth Mark J, Liefeith Andreas
Int J Sports Physiol Perform. 2019 Oct 30;15(4):554-561. doi: 10.1123/ijspp.2019-0058. Print 2020 Apr 1.
To compare the effects of velocity-based training (VBT) vs percentage-based training (PBT) on strength, speed, and jump performance in academy rugby league players during a 7-wk in-season mesocycle.
A total of 27 rugby league players competing in the Super League U19s Championship were randomized to VBT (n = 12) or PBT (n = 15). Both groups completed a 7-wk resistance-training intervention (2×/wk) that involved the back squat. The PBT group used a fixed load based on a percentage of 1-repetition maximum (1-RM), whereas the VBT group used a modifiable load based on individualized velocity thresholds. Biomechanical and perceptual data were collected during each training session. Back-squat 1-RM, countermovement jump, reactive strength index, sprint times, and back-squat velocity at 40-90% 1-RM were assessed pretraining and posttraining.
The PBT group showed likely to most likely improvements in 1-RM strength and reactive strength index, whereas the VBT group showed likely to very likely improvements in 1-RM strength, countermovement jump height, and back-squat velocity at 40% and 60% 1-RM. Sessional velocity and power were most likely greater during VBT compared with PBT (standardized mean differences = 1.8-2.4), while time under tension and perceptual training stress were likely lower (standardized mean differences = 0.49-0.66). The improvement in back-squat velocity at 60% 1-RM was likely greater following VBT compared with PBT (standardized mean difference = 0.50).
VBT can be implemented during the competitive season, instead of traditional PBT, to improve training stimuli, decrease training stress, and promote velocity-specific adaptations.
比较基于速度的训练（VBT）与基于百分比的训练（PBT）对学院橄榄球联盟球员在为期7周的赛季中期循环中力量、速度和跳跃表现的影响。
共有27名参加超级联赛U19锦标赛的橄榄球联盟球员被随机分为VBT组（n = 12）或PBT组（n = 15）。两组都完成了为期7周的阻力训练干预（每周2次），其中包括后深蹲。PBT组使用基于1次重复最大值（1-RM）百分比的固定负荷，而VBT组使用基于个性化速度阈值的可调节负荷。在每次训练期间收集生物力学和感知数据。在训练前和训练后评估后深蹲1-RM、反向移动跳跃、反应力量指数、冲刺时间以及40%-90% 1-RM时的后深蹲速度。
PBT组在1-RM力量和反应力量指数方面显示出可能到很可能的改善，而VBT组在1-RM力量、反向移动跳跃高度以及40%和60% 1-RM时的后深蹲速度方面显示出可能到非常可能的改善。与PBT相比，VBT期间的训练速度和功率很可能更高（标准化均值差异 = 1.8 - 2.4），而张力下时间和感知训练压力很可能更低（标准化均值差异 = 0.49 - 0.66）。与PBT相比，VBT后60% 1-RM时后深蹲速度的改善很可能更大（标准化均值差异 = 0.50）。
在竞争赛季中可以实施VBT而非传统的PBT，以改善训练刺激、降低训练压力并促进特定速度的适应性变化。
