College of Nursing and Health Sciences, Texas A&M, International University, Laredo, Texas.
Department of Kinesiology, Samford University, Birmingham, Alabama.
J Strength Cond Res. 2020 Sep;34(9):2427-2433. doi: 10.1519/JSC.0000000000003731.
Nickerson, BS, Williams, TD, Snarr, RL, Garza, JM, and Salinas, G. Evaluation of load-velocity relationships and repetitions-to-failure equations in the presence of male and female spotters. J Strength Cond Res 34(9): 2427-2433, 2020-The purpose of this study was 2 fold: (a) to determine whether differences in mean concentric velocity (MCV), repetitions-to-failure (RTF), measured 1 repetition maximum (1RM), and 1RM prediction methods vary between lifter and spotter sex and (b) determine the accuracy of velocity-based 1RM (MCV1RM) and repetitions-to-failure-based 1RM (RTF1RM) prediction equations in the presence of either a male or female spotter. Twenty resistance-trained individuals (50% men) participated in this study. The initial 2 visits involved measuring 1RM for the bench press with a male or female spotter. Visits 3 and 4 required subjects to lift loads at 30 (5-repetitions), 50 (5-repetitions), and 70% 1RM (RTF) in the presence of a male or female spotter. Velocity-based 1RM was determined through individual regression equations using the submaximal loads (MCV30, MCV50, and MCV70). Repetitions-to-failure-based 1RM was determined through the RTF at 70% 1RM using Wathen (Wathen1RM), Mayhew (Mayhew1RM), and Epley (Epley1RM) equations. There were significant interactions when assessing Wathen1RM and Mayhew1RM (p < 0.05). Female lifters produced significantly higher estimated 1RM values during the male spotter condition using Wathen1RM and Mayhew1RM than the female spotter condition (p = 0.032 and 0.033, respectively). MCV1RM and Epley1RM produced smaller mean differences than Wathen1RM and Mayhew1RM when compared with measured 1RM. However, MCV1RM produced the largest standard error of estimate, whereas Epley1RM produced the lowest values. Epley1RM should be used over MCV1RM, Wathen1RM, and Mayhew1RM when loads up to 70% 1RM are implemented. Also, spotter sex only seems to impact female lifters when using the RTF1RM prediction equations of Wathen1RM and Mayhew1RM.
尼克森，BS，威廉姆斯，TD，斯纳，RL，加尔扎，JM，和萨利纳斯，G. 评估男性和女性保护者存在时的负荷-速度关系和重复失效方程。J 力量康迪研究 34(9)：2427-2433，2020-本研究的目的有两个：(a) 确定男性和女性保护者之间的平均向心速度 (MCV)、重复失效 (RTF)、测量的 1 重复最大 (1RM) 和 1RM 预测方法是否存在差异，(b) 确定基于速度的 1RM(MCV1RM)和基于重复失效的 1RM(RTF1RM)预测方程在有男性或女性保护者时的准确性。20 名受过阻力训练的个体(50%为男性)参加了这项研究。最初的 2 次访问涉及使用男性或女性保护者测量卧推 1RM。第 3 和第 4 次访问要求受试者在男性或女性保护者的帮助下，以 30%(5 次重复)、50%(5 次重复)和 70%1RM(RTF)的速度进行举重。基于速度的 1RM 通过使用亚最大负荷 (MCV30、MCV50 和 MCV70) 的个体回归方程确定。基于 Wathen( Wathen1RM)、Mayhew(Mayhew1RM)和 Epley(Epley1RM)方程，通过在 70%1RM 时的 RTF 确定基于重复失效的 1RM。当评估 Wathen1RM 和 Mayhew1RM 时，存在显著的相互作用(p < 0.05)。在使用 Wathen1RM 和 Mayhew1RM 时，女性举重运动员在男性保护者的情况下产生的估计 1RM 值明显高于女性保护者的情况(p = 0.032 和 0.033)。与实测 1RM 相比，MCV1RM 和 Epley1RM 产生的平均差异较小。然而，MCV1RM 产生的估计标准误差最大，而 Epley1RM 产生的误差最小。当实施高达 70%1RM 的负荷时，应使用 Epley1RM 代替 MCV1RM、Wathen1RM 和 Mayhew1RM。此外，当使用 Wathen1RM 和 Mayhew1RM 的 RTF1RM 预测方程时，只有女性举重运动员的保护者性别似乎会产生影响。
