Pérez-Castilla Alejandro, Miras-Moreno Sergio, Janicijevic Danica, García-Ramos Amador
Department of Physical Education and Sport, Faculty of Sport Sciences, University of Granada, Granada, Spain.
Faculty of Sport and Physical Education, The Research Center, University of Belgrade, Belgrade, Serbia; and.
J Strength Cond Res. 2023 May 1;37(5):1001-1008. doi: 10.1519/JSC.0000000000004365. Epub 2022 Oct 18.
Pérez-Castilla, A, Miras-Moreno, S, Janicijevic, D, and García-Ramos, A. Velocity loss is not an accurate predictor of the percentage of completed repetitions during the prone bench pull exercise. J Strength Cond Res 37(5): 1001-1008, 2023-The primary aim of this study was to explore the goodness of fit and accuracy of both general and individual relationships between the magnitude of velocity loss (%VL) and the percentage of performed repetitions with respect to the maximal number of repetitions that can be completed to failure (%Rep) during the Smith machine prone bench pull exercise. Fifteen male sports science students completed a preliminary session to determine the bench pull one-repetition maximum (1RM) and 2 identical experimental sessions separated by 48-72 hours. In each experimental session, subjects randomly performed single sets of repetitions to failure separated by 10 minutes against the 60% 1RM, 70% 1RM, and 80% 1RM during the Smith machine bench pull exercise. Individual %Rep-%VL relationships presented a greater goodness of fit than general %Rep-%VL relationships at the 60% 1RM ( R2 = 0.85-0.97 vs. 0.79-0.85), 70% 1RM ( R2 = 0.84-0.99 vs. 0.77-0.84), and 80% 1RM ( R2 = 0.84-1.00 vs. 0.74-0.80). However, the accuracy (absolute errors) in estimating the %Rep during the second testing session based on the %Rep-%VL equations obtained in the first testing session did not differ between the individual and general %Rep-%VL equations in 8 of 9 comparisons ( p ≥ 0.102). The absolute errors between the actual and predicted %REP were unacceptable (>10%) in 11 of 18 comparisons, and acceptable (5-10%) in 7 of 18 comparisons. These results highlight that the %Rep cannot be estimated with high degree of accuracy from VL recordings during the Smith machine bench pull exercise, regardless of whether individual or general Rep-%VL relationships are considered.
佩雷斯 - 卡斯蒂利亚，A，米拉斯 - 莫雷诺，S，亚尼西耶维奇，D，以及加西亚 - 拉莫斯，A。在史密斯机俯卧凳拉练习中，速度损失并非完成重复次数百分比的准确预测指标。《力量与体能研究杂志》37(5): 1001 - 1008，2023年。本研究的主要目的是探讨在史密斯机俯卧凳拉练习中，速度损失幅度（%VL）与相对于可完成至力竭的最大重复次数的执行重复次数百分比（%Rep）之间的一般关系和个体关系的拟合优度及准确性。15名男性运动科学专业学生完成了一次初步测试，以确定凳拉的一次重复最大值（1RM），并进行了2次相同的实验测试，间隔48 - 72小时。在每次实验测试中，受试者在史密斯机凳拉练习中，针对60% 1RM、70% 1RM和80% 1RM，随机进行单组重复至力竭，每组间隔10分钟。在60% 1RM（R² = 0.85 - 0.97对0.79 - 0.85）、70% 1RM（R² = 0.84 - 0.99对0.77 - 0.84）和80% 1RM（R² = 0.84 - 1.00对0.74 - 0.80）时，个体%Rep - %VL关系的拟合优度高于一般%Rep - %VL关系。然而，在9次比较中的8次中，基于第一次测试获得的%Rep - %VL方程估计第二次测试中的%Rep时，个体和一般%Rep - %VL方程的准确性（绝对误差）并无差异（p≥0.102）。在18次比较中的11次中，实际和预测的%REP之间的绝对误差不可接受（>10%），在18次比较中的7次中可接受（5 - 10%）。这些结果表明，在史密斯机凳拉练习中，无论考虑个体还是一般的Rep - %VL关系，都无法根据VL记录高精度地估计%Rep。
