Validity of inertial measurement unit-based knee flexion strength-power test

被引:2
作者
Nagahara, Ryu [1 ]
Kameda, Mai [1 ]
Neville, Jonathon [2 ]
机构
[1] Natl Inst Fitness & Sports Kanoya, 1 Shiromizu Cho, Kanoya, Kagoshima 8912393, Japan
[2] Auckland Univ Technol, Sports Performance Res Inst New Zealand, Auckland, New Zealand
关键词
Joint torque; leg; accelerometer; gyroscope; fitness test; inertial measurement unit; RELIABILITY; PREDICTORS; LEG;
D O I
10.1177/1754337119845601
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
This study aimed to examine the concurrent validity of inertial measurement unit-based knee flexion strength-power test variables. Ten physically active males performed a knee flexion strength-power test, consisting of serial right knee flexion-extension motions. Two trials were performed, each at 50%, 75% and 100% effort. Lower-extremity motion during the trial was recorded using a motion capture system and an inertial measurement unit. For inertial measurement unit data, the measured length of each lower-extremity segment was used to estimate segment endpoint coordinates. Knee flexion kinetic variables were then computed using inverse dynamics analysis for both systems. The inertial measurement unit provided comparable values with the motion capture system for angular impulse, mean moment, positive work and mean power (-0.8%, 1.0%, -0.9%, and 1.5%, respectively). Moreover, intraclass correlation coefficients and correlation coefficients for angular impulse, mean moment, positive work and mean power of knee flexion were acceptably high (ICC or r = 0.903-0.970). For positive mean power, however, a Bland-Altman plot showed heteroscedasticity. For knee flexion negative work and mean power, the inertial measurement unit clearly showed an overestimation of the values (32.5% and 23.5%, respectively). Moreover, the intraclass correlation coefficients and correlation coefficients were not acceptably high for knee flexion negative work and mean power (ICC or r = 0.541-0.899). These results indicate that the angular impulse, mean moment and positive work can be measured accurately and validly using an inertial measurement unit for knee flexion strength-power test variables. Given its simplicity, the suggested inertial measurement unit-based knee flexion strength-power test would improve on-the-field physical fitness evaluation.
引用
收藏
页码:443 / 449
页数:7
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