Sport Performance Research Institute New Zealand (SPRINZ), Auckland University of Technology, Auckland, New Zealand.
School of Engineering, Computer and Mathematical Sciences, Auckland University of Technology, Auckland, New Zealand.
Eur J Appl Physiol. 2023 Jun;123(6):1343-1357. doi: 10.1007/s00421-023-05155-x. Epub 2023 Feb 24.
The aim of this study was to examine the goodness of fit, prediction accuracy, and stability of general and individual relationships between velocity loss and the percentage of completed repetitions out of maximum possible (VL-%) in the free-weight back squat exercise. The effects of sex, training status and history, as well as personality traits, on the goodness of fit and the accuracy of these relationships were also investigated.
Forty-six resistance-trained people (15 females and 31 males) performed a one-repetition maximum (1RM) test, and two repetitions to failure (RTF) tests, 72 h apart. RTF tests were performed with 70, 80, and 90% of 1RM with 10 min inter-set rest.
The findings question the utility of using general and individual VL-% relationships to prescribe training volume with free-weight back squats as (1) the agreement in the % completed until reaching a given velocity loss threshold across two consecutive testing sessions was unacceptable, regardless of the load used; and (2) the ability of general and individual VL-% relationships to predict % in a subsequent testing session were poor (absolute errors > 10%). Sex, training status and history, and personality traits did not affect the goodness of fit of general and individual VL-% relationships or their prediction accuracy, suggesting potential generalisability of those findings among resistance-trained populations.
VL-% relationships do not seem to provide any additional benefits compared to costless, traditional methods and hence should not be used for monitoring and prescribing resistance training with a free-weight back squat exercise.
本研究旨在检验自由重量深蹲运动中速度损失与最大可能重复次数百分比（VL-%）之间的一般关系和个体关系的拟合优度、预测准确性和稳定性。还研究了性别、训练状态和历史以及人格特质对拟合优度和这些关系准确性的影响。
46 名阻力训练人员（15 名女性和 31 名男性）进行了一次 1 次最大重复测试（1RM）和两次至力竭测试（RTF），相隔 72 小时。RTF 测试分别使用 70%、80%和 90%的 1RM 进行，每组之间休息 10 分钟。
研究结果质疑了使用通用和个体 VL-%关系来规定自由重量深蹲训练量的实用性，因为：（1）无论使用何种负荷，在两个连续测试会话中达到给定速度损失阈值时，完成的百分比的一致性是不可接受的；（2）通用和个体 VL-%关系预测后续测试会话中的百分比的能力很差（绝对误差> 10%）。性别、训练状态和历史以及人格特质不会影响通用和个体 VL-%关系的拟合优度或其预测准确性，这表明这些发现可能在阻力训练人群中具有普遍性。
与无成本的传统方法相比，VL-%关系似乎没有提供任何额外的好处，因此不应将其用于监测和规定自由重量深蹲运动的阻力训练。
