School of Behavioural and Health Sciences, Australian Catholic University, Brisbane, Australia.
Carnegie Applied Rugby Research (CARR) Centre, Carnegie School of Sport, Leeds, United Kingdom.
J Strength Cond Res. 2024 Mar 1;38(3):465-473. doi: 10.1519/JSC.0000000000004642. Epub 2023 Nov 16.
Weakley, J, Johnston, RD, Cowley, N, Wood, T, Ramirez-Lopez, C, McMahon, E, and García-Ramos, A. The effects and reproducibility of 10, 20, and 30% velocity loss thresholds on acute and short-term fatigue and recovery responses. J Strength Cond Res 38(3): 465-473, 2024-This study aimed to establish the effects and reproducibility of implementing 10, 20, and 30% velocity loss thresholds (VLTs) during the free-weight barbell back squat on acute and short-term perceived soreness, neuromuscular fatigue, and physical performance. Using a repeated, counterbalanced, crossover design, 12 team-sport athletes completed on separate sessions 5 sets of the free-weight barbell back-squat until reaching VLTs of either 10, 20, or 30%. Outcomes were measured immediately postexercise and 24 hours after each session. To assess reproducibility, the same sessions were repeated after 4 weeks. Immediately postexercise, small differences in countermovement jump (CMJ) and 10-m sprint performance were observed between VLT conditions, whereas small to moderate differences in differential ratings of perceived exertion were reported (10% < 20% < 30%). At 24 hours, trivial differences in CMJ outcomes were found but small differences in 10-m sprint performance were detected between conditions (10% < 20% < 30%). In addition, at 24 hours, a single small difference in radial deformation using tensiomyography was found between 10 and 30% conditions, whereas large to very large differences in perceived soreness were reported between conditions (10% < 20% < 30%). Finally, the standard error of measurement of all outcome measures at 24 hours were of a similar magnitude to those reported in tightly controlled, short-term studies. Collectively, these findings demonstrate that VLTs help control the fatigue outcomes that occur as a response to resistance training and that they are reproducible. Therefore, for practitioners who wish to prescribe resistance training and be confident in the subsequent fatigue response, it is strongly advised that VLTs are implemented.
威克利、J、约翰斯顿、RD、考利、N、伍德、T、拉米雷斯-洛佩兹、C、麦克马洪、E 和加西亚-拉莫斯、A. 10%、20%和 30%速度损失阈值对急性和短期疲劳及恢复反应的影响和可重复性。J 力量与调理研究 38（3）：465-473，2024-本研究旨在确定在自由重量杠铃深蹲过程中实施 10%、20%和 30%速度损失阈值（VLT）对急性和短期感知酸痛、神经肌肉疲劳和身体表现的影响和可重复性。使用重复、平衡、交叉设计，12 名团队运动运动员在单独的会议上完成 5 组自由重量杠铃深蹲，直到达到 10%、20%或 30%的 VLT。结果在运动后立即和每次会议后 24 小时进行测量。为了评估可重复性，在 4 周后重复相同的会议。运动后立即，在 VLT 条件之间观察到反跳跳（CMJ）和 10 米冲刺表现的微小差异，而报告的差异感知用力的差异较小至中等（10%<20%<30%）。24 小时后，CMJ 结果发现差异较小，但在条件之间发现 10 米冲刺性能的差异较小（10%<20%<30%）。此外，在 24 小时时，在 10%和 30%条件之间发现了 tensiomyography 中单个较小的径向变形差异，而在条件之间报告了较大至非常大的感知酸痛差异（10%<20%<30%）。最后，在 24 小时时，所有结果测量的测量标准误差与短期研究中报告的相似。总的来说，这些发现表明 VLT 有助于控制作为阻力训练反应发生的疲劳结果，并且它们是可重复的。因此，对于希望规定阻力训练并对随后的疲劳反应有信心的从业者，强烈建议实施 VLT。
