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Inertial measurement unit based knee flexion strength-power test for sprinters
International Journal of Sports Science & Coaching ( IF 2.029 ) Pub Date : 2020-06-21 , DOI: 10.1177/1747954120937374
Ryu Nagahara 1, 2 , Munenori Murata 1, 2
Affiliation  

This study aimed to examine whether sprinting performance would be associated with knee flexion strength-power capabilities measured using a recently developed inertial measurement unit (IMU) based system. Sixteen male sprinters performed 60-m sprints and the IMU based knee flexion strength-power test which consisted of five serial knee flexion-extension motions in three conditions (unweighted, 0.75 or 1.5 kg ankle weighted) for both legs. Spatiotemporal variables during sprinting for a 50-m distance were obtained using a long force platform system. The knee flexion joint kinetic variables during the knee flexion strength-power test were collected using one IMU. Running acceleration during the entire sprinting was positively correlated with the knee flexion positive work measured using the unweighted right knee flexion strength-power test (r = .521–.721). Moreover, step frequencies at the 13th–16th, 17th–20th and 21st–22nd step sections and during the entire sprint were positively correlated with the knee flexion positive work measured using the unweighted right knee flexion strength-power test (r = .506–.566), while step length did not show any correlations with the knee flexion strength-power test variables. The results demonstrate that the greater right knee flexion strength-power capabilities measured using IMU based method in the unweighted condition are advantageous for better sprinting performance through higher step frequency. The IMU-based knee flexion strength-power test in the right leg unweighted condition will likely be useful for physical fitness evaluation of sprinters on the field setting.

中文翻译:

基于惯性测量单元的短跑运动员膝关节屈曲力量测试

本研究旨在检查短跑性能是否与使用最近开发的基于惯性测量单元 (IMU) 的系统测量的膝关节屈曲力量-功率能力相关。16 名男性短跑运动员进行了 60 米短跑和基于 IMU 的膝关节屈曲力量测试,该测试包括双腿在三种条件下(未负重、0.75 或 1.5 公斤踝关节负重)的 5 次连续膝关节屈伸运动。使用长力平台系统获得 50 米距离冲刺期间的时空变量。使用一个 IMU 收集膝关节屈曲强度-功率测试期间的膝关节屈曲关节动力学变量。整个冲刺期间的跑步加速度与使用未加权右膝屈曲力量-功率测试(r = . 521–.721)。此外,在第 13-16 步、第 17-20 步和第 21-22 步部分以及整个冲刺期间的步频与使用未加权右膝屈曲力量-功率测试(r = .506– .566),而步长与膝关节屈曲强度-功率测试变量没有任何相关性。结果表明,在未加权条件下使用基于 IMU 的方法测量的更大的右膝屈曲力量-功率能力有利于通过更高的步频获得更好的短跑性能。在右腿未负重条件下基于 IMU 的膝关节屈曲力量-功率测试可能对短跑运动员在野外环境中的体能评估有用。第 17-20 步和第 21-22 步部分以及在整个冲刺期间与使用未加权的右膝屈曲力量测试(r = .506-.566)测量的膝关节屈曲正功呈正相关,而步长未显示与膝关节屈曲强度-功率测试变量的任何相关性。结果表明,在未加权条件下使用基于 IMU 的方法测量的更大的右膝屈曲力量-功率能力有利于通过更高的步频获得更好的短跑性能。在右腿未负重条件下基于 IMU 的膝关节屈曲力量-功率测试可能对短跑运动员在野外环境中的体能评估有用。第 17-20 步和第 21-22 步部分以及在整个冲刺期间与使用未加权的右膝屈曲力量测试(r = .506-.566)测量的膝关节屈曲正功呈正相关,而步长未显示与膝关节屈曲强度-功率测试变量的任何相关性。结果表明,在未加权条件下使用基于 IMU 的方法测量的更大的右膝屈曲力量-功率能力有利于通过更高的步频获得更好的短跑性能。在右腿未负重条件下基于 IMU 的膝关节屈曲力量-功率测试可能对短跑运动员在野外环境中的体能评估有用。
更新日期:2020-06-21
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