Martín-San Agustín Rodrigo, Sánchez-Barbadora Mariana, García-Vidal José A
Department of Physiotherapy, University of Valencia, Valencia, España.
Department of Physiotherapy, University of Murcia, Murcia, Spain.
PeerJ. 2020 Oct 9;8:e10169. doi: 10.7717/peerj.10169. eCollection 2020.
Inertial hamstring exercises promote functional changes leading to lower rates of hamstring injuries. However, variable training measurement systems have not been specifically validated for hamstring exercises. Accordingly, this study aimed to evaluate the validity of the Inertial Measurement System (IMS) to measure the velocity, force, and power during the performance of different hamstring exercises on a flywheel resistance training device.
Fifteen males (average age: 22.4 ± 2.5 years; body mass: 77.3 ± 9.8 kg; height: 179.5 ± 7.4 cm; weekly physical activity: 434.0 ± 169.2 min; years of strength training: 4.3 ± 2.2 years) performed the bilateral stiff-leg deadlift (SDL), 45° hip extension (HE), and unilateral straight knee bridge (SKB) in two sessions (familiarization and evaluation) with a 1-week interval between them. The velocity, force, and power (average and peak values) in the concentric and eccentric phases for each of the exercises were recorded simultaneously with IMS and MuscleLab.
Consistency between IMS and MuscleLab was good to excellent for all variables, with ranges from 0.824 to 0.966 in SDL, from 0.822 to 0.971 in HE, and from 0.806 to 0.969 in SKB. Acceptable levels of agreement between devices were observed in general for all exercises, the "bias" ranging from 1.1% to 13.2%. Although MuscleLab showed higher values than IMS for peak velocity, force and power values, the effect size was only relevant for 5 of the 36 parameters. IMS is a new and valid system to monitor inertial hamstring exercises on a new flywheel device. In this way, IMS could have potential practical applications for any professional or athlete who wants to monitor inertial hamstring exercises.
惯性绳肌练习可促进功能改变，从而降低绳肌损伤发生率。然而，可变训练测量系统尚未针对绳肌练习进行专门验证。因此，本研究旨在评估惯性测量系统（IMS）在飞轮阻力训练设备上进行不同绳肌练习时测量速度、力量和功率的有效性。
15名男性（平均年龄：22.4±2.5岁；体重：77.3±9.8千克；身高：179.5±7.4厘米；每周体育活动时间：434.0±169.2分钟；力量训练年限：4.3±2.2年）分两个阶段（熟悉阶段和评估阶段）进行双侧直腿硬拉（SDL）、45°髋关节伸展（HE）和单侧直膝桥（SKB）练习，两阶段间隔1周。使用IMS和MuscleLab同时记录每个练习在向心和离心阶段的速度、力量和功率（平均值和峰值）。
IMS和MuscleLab在所有变量上的一致性良好至优秀，SDL的一致性范围为0.824至0.966，HE为0.822至0.971，SKB为0.806至0.969。总体而言，所有练习在设备之间均观察到可接受的一致性水平，“偏差”范围为1.1%至13.2%。尽管MuscleLab在峰值速度、力量和功率值方面显示出比IMS更高的值，但效应大小仅在36个参数中的5个参数上具有相关性。IMS是一种用于监测新型飞轮设备上惯性绳肌练习的新型有效系统。通过这种方式，IMS对于任何想要监测惯性绳肌练习的专业人员或运动员可能具有潜在的实际应用价值。
