Department of Physical Education and Sports, Faculty of Sport Sciences, University of Granada, Granada, Spain.
Sport and Health University Research Center (iMUDS), University of Granada, Granada, Spain.
PLoS One. 2024 Oct 24;19(10):e0312348. doi: 10.1371/journal.pone.0312348. eCollection 2024.
This study aimed to determine the validity and between-day reliability of the mean velocity (MV), peak velocity (PV), mean power (MP), and peak power (PP) provided by the Vitruve linear position transducer at different submaximal loads in the free-weight and Smith machine back squat using GymAware as a reference point. Fourteen male sports science students (free-weight back squat one-repetition maximum [1RM]: 132.5 ± 28.5 kg, Smith machine back squat 1RM: 163.9 ± 30.4 kg) performed six experimental sessions, twice per week with 72 hours of rest. The first two included the assessment of the 1RM of both exercises. In the four remaining, both linear position transducers were simultaneously used to record MV, PV, MP, PP of each repetition during an incremental load test (i.e., 20, 40, 60, 80, 90% 1RM) with three minutes of rest between sets. Vitruve displayed both fixed and proportional bias for certain relative loads across all variables. Vitruve did not meet the validity criteria for all (MV, PP) or at least two (MP, PV) relative loads (Coefficient of variation [CV] > 10%; Pearson correlation < 0.70; Effect size > 0.60). MV, PV, MP, and PP recorded by Vitruve displayed acceptable reliability (CV < 10%) with superior reliability observed during a Smith Machine compared to free-weight back squat, and for velocity compared to power variables. Considering GymAware as a reference point, Vitruve was not valid for measuring velocity and power outcomes. Acceptable validity was observed only for PV in the Smith machine back squat, while the other variables-regardless of relative loads and exercise modes-were mostly inaccurate. All variables demonstrated acceptable reliability, with greater reliability noted in the Smith machine compared to the free-weight back squat exercise mode.
本研究旨在确定 Vitruve 线性位置传感器在不同亚最大负荷下（自由重量深蹲 1RM：132.5±28.5kg，史密斯机深蹲 1RM：163.9±30.4kg）提供的平均速度（MV）、峰值速度（PV）、平均功率（MP）和峰值功率（PP）在自由重量和史密斯机深蹲中的有效性和日内可靠性，并以 GymAware 为参考点。14 名男性运动科学学生进行了六次实验，每周两次，每次之间休息 72 小时。前两次包括对两种练习的 1RM 评估。在剩下的四次中，同时使用两个线性位置传感器在递增负荷测试（即 20、40、60、80、90%1RM）中记录每一次重复的 MV、PV、MP、PP，每组之间休息三分钟。Vitruve 在所有变量中对于某些相对负荷都显示出固定和比例偏差。Vitruve 没有满足所有（MV、PP）或至少两个（MP、PV）相对负荷的有效性标准（变异系数[CV]＞10%；皮尔逊相关系数＜0.70；效应量＞0.60）。Vitruve 记录的 MV、PV、MP 和 PP 具有可接受的可靠性（CV＜10%），在史密斯机器上比在自由重量深蹲中观察到更好的可靠性，并且在速度上比在功率变量上观察到更好的可靠性。考虑到 GymAware 作为参考点，Vitruve 用于测量速度和功率结果是无效的。仅在史密斯机深蹲中观察到对 PV 的可接受有效性，而其他变量-无论相对负荷和运动模式如何-都不准确。所有变量都表现出可接受的可靠性，在史密斯机器上比在自由重量深蹲运动模式上的可靠性更高。
