Sport Sciences Department, Miguel Hernandez University, 03202 Elche, Spain.
Sensors (Basel). 2024 Mar 19;24(6):1951. doi: 10.3390/s24061951.
Movement control can be an indicator of how challenging a task is for the athlete, and can provide useful information to improve training efficiency and prevent injuries. This study was carried out to determine whether inertial measurement units (IMU) can provide reliable information on motion variability during strength exercises, focusing on the squat. Sixty-six healthy, strength-trained young adults completed a two-day protocol, where the variability in the squat movement was analyzed at two different loads (30% and 70% of one repetition maximum) using inertial measurement units and a force platform. The time series from IMUs and force platforms were analyzed using linear (standard deviation) and non-linear (detrended fluctuation analysis, sample entropy and fuzzy entropy) measures. Reliability was analyzed for both IMU and force platform using the intraclass correlation coefficient and the standard error of measurement. Standard deviation, detrended fluctuation analysis, sample entropy, and fuzzy entropy from the IMUs time series showed moderate to good reliability values (ICC: 0.50-0.85) and an acceptable error. The study concludes that IMUs are reliable tools for analyzing movement variability in strength exercises, providing accessible options for performance monitoring and training optimization. These findings have implications for the design of more effective strength training programs, emphasizing the importance of movement control in enhancing athletic performance and reducing injury risks.
运动控制可以作为衡量运动员运动难度的指标，并且可以提供有用的信息，以提高训练效率和预防受伤。本研究旨在确定惯性测量单元（IMU）是否可以为力量练习中的运动变异性提供可靠的信息，重点关注深蹲。66 名健康、有力量训练经验的年轻人完成了为期两天的方案，使用惯性测量单元和力量平台分析了两种不同负荷（30%和 70%的最大重复次数）下深蹲运动的变异性。使用线性（标准差）和非线性（去趋势波动分析、样本熵和模糊熵）测量方法分析了来自 IMU 和力量平台的时间序列。使用组内相关系数和测量误差标准对 IMU 和力量平台的可靠性进行了分析。来自 IMU 时间序列的标准差、去趋势波动分析、样本熵和模糊熵的可靠性值为中等至良好（ICC：0.50-0.85），误差可接受。研究结论是，IMU 是分析力量练习中运动变异性的可靠工具，为性能监测和训练优化提供了可及的选择。这些发现对设计更有效的力量训练计划具有重要意义，强调了运动控制在提高运动表现和降低受伤风险方面的重要性。
