Pérez-Castilla Alejandro, Jerez-Mayorga Daniel, Martínez-García Dario, Rodríguez-Perea Ángela, Chirosa-Ríos Luis J, García-Ramos Amador
Int J Sports Physiol Perform. 2020 Mar 17;15(7):949-957. doi: 10.1123/ijspp.2019-0549. Print 2020 Aug 1.
To compare the load-velocity (L-V) relationship between bench-press exercises performed using 4 different grip widths, to determine the association between the anthropometric characteristics and L-V profile, and to explore whether a multiple linear-regression model with movement velocity and subjects' anthropometric characteristics as predictor variables could increase the goodness of fit of the individualized L-V relationship.
The individual L-V relationship of 20 men was evaluated by means of an incremental loading test during the bench-press exercise performed on a Smith machine using narrow, medium, wide, and self-selected grip widths. Simple and multiple linear-regression models were performed.
The mean velocity associated with each relative load did not differ among the 4 grip widths (P ≥ .130). Only body height and total arm length were correlated with the mean velocity associated with light and medium loads (r ≥ .464). A slightly higher variance of the velocity attained at each relative load was explained when some anthropometric characteristics were used as predictor variables along with the movement velocity (r2 = .969 [.965-.973]) in comparison with the movement velocity alone (r2 = .966 [.955-.968]). However, the amount of variance explained by the individual L-V relationships was always higher than with the multiple linear-regression models (r2 = .995 [.985-1.000]).
These results indicate that the individual determination of the L-V relationship using a self-selected grip width could be recommended to monitor relative loads in the Smith machine bench-press exercise.
比较使用4种不同握距进行卧推练习时的负荷 - 速度（L - V）关系，确定人体测量学特征与L - V曲线之间的关联，并探讨以运动速度和受试者人体测量学特征作为预测变量的多元线性回归模型是否能提高个体化L - V关系的拟合优度。
通过在史密斯机上使用窄、中、宽和自选握距进行卧推练习时的递增负荷测试，评估20名男性的个体L - V关系。进行简单和多元线性回归模型分析。
4种握距下与每个相对负荷相关的平均速度无差异（P≥.130）。仅身高和总臂长与轻、中负荷下的平均速度相关（r≥.464）。与仅使用运动速度相比，当将一些人体测量学特征与运动速度一起用作预测变量时，每个相对负荷下达到的速度的方差解释略有增加（r² =.969 [.965 -.973]），而仅运动速度时为r² =.966 [.955 -.968]）。然而，个体L - V关系解释的方差量始终高于多元线性回归模型（r² =.995 [.985 - 1.000]）。
这些结果表明，推荐使用自选握距个体测定L - V关系，以监测史密斯机卧推练习中的相对负荷。
