Lake Jason, Naworynsky David, Duncan Freddie, Jackson Matt
Department of Sport and Exercise Sciences, University of Chichester, College Lane, Chichester PO19 6PE, UK.
Sports (Basel). 2017 Sep 19;5(3):70. doi: 10.3390/sports5030070.
The aim of this study was to compare the actual deadlift one repetition maximum (1RM) and the deadlift 1RM predicted from individualised load-velocity profiles. Twelve moderately resistance-trained men participated in three deadlift sessions. During the first, 1RM was assessed; during the second, load-velocity profiles were recorded with six loads (65% to 90% 1RM) using a linear position transducer recording at 1000 Hz; and during the third, minimal velocity thresholds (MVT) were recorded from the velocity of the last repetition during sets to volitional fatigue with 70% and 80% 1RM with a linear position transducer recording at 1000 Hz. Regression was then used to generate individualised load-velocity profiles and the MVT was used as a cut-off value from which to predict deadlift 1RM. In general, velocity reliability was poor to moderate. More importantly, predicted deadlift 1RMs were significantly and meaningfully less than actual deadlift 1RMs ( < 0.05, = 1.03⁻1.75). The main practical application that should be taken from the results of this study is that individualized load-velocity profiles should not be used to predict deadlift 1RM. Practitioners should not use this method in combination with the application of MVT obtained from the last repetition of sets to volitional fatigue.
本研究的目的是比较实际的一次重复最大重量硬拉（1RM）与根据个性化负荷-速度曲线预测的硬拉1RM。12名中度抗阻训练的男性参加了三次硬拉训练。在第一次训练中，评估1RM；在第二次训练中，使用线性位置传感器以1000Hz的频率记录六种负荷（65%至90% 1RM）下的负荷-速度曲线；在第三次训练中，使用线性位置传感器以1000Hz的频率记录在70%和80% 1RM下进行到自愿疲劳的组中最后一次重复的速度，以此记录最小速度阈值（MVT）。然后使用回归分析生成个性化的负荷-速度曲线，并将MVT用作预测硬拉1RM的临界值。总体而言，速度可靠性较差至中等。更重要的是，预测的硬拉1RM显著且有意义地低于实际硬拉1RM（<0.05，效应量=1.03⁻1.75）。本研究结果的主要实际应用是，不应使用个性化的负荷-速度曲线来预测硬拉1RM。从业者不应将此方法与从进行到自愿疲劳的组的最后一次重复中获得的MVT的应用相结合。
