三维步态分析对下肢生物力学变化的重测信度研究

目的:观察健康人在步行过程中下肢运动学、动力学、地面反作用力以及表面肌电信号的重测信度。方法:采用VICON (NEXUS 1.8.5)三维步态分析系统及NORAXON无线表面肌电图测试13名健康人步行过程中下肢运动学、动力学、地面反作用力以及表面肌电信号的重测信度。采用组内相关系数(ICC)及测量标准误(SEM)比较两次测试结果的相对信度与绝对信度。结果:步行过程中步速、下肢运动学、动力学、地面反作用力以及表面肌电信号均具有良好的重测信度ICC 0.78～0.96,运动学参数测量标准误SEM%为4.18～15.6,动力学参数SEM%为3.31～21.82,地面反作用力SEM%为1.70～16.67,表面肌电信号SEM%为8.00～11.11。结论:三维步态分析系统结合表面肌电图可用于评估步行时下肢运动学、动力学、地面反作用力以及表面肌电信号,且具有良好的重测信度。

Test-retest reliability of lower extremity biomechanics by three-dimensional gait analysis

Objective: To determine the test-retest reliability of kinetics, kinematics, ground reaction force (GRF) and the surface electromyography (sEMG) signal during gait in healthy subjects. Method: Kinetics, kinematics, GRF and the sEMG signals of 13 healthy subjects were collected by VICON (NEXUS 1.8.5) three dimensional gait analysis system, AMTI force plates and NORAXON wireless sEMG. The indicators of test retest reliability of kinetics, kinematics, GRF and the sEMG signals were intraclass correlation coefficient (ICC) and standard error of measurement (SEM), and they were used to analyze the test-retest reliability between those two sessions.Results: The test-retest reliability of walking speed, kinetics, kinematics, GRF and the sEMG signals was modest, and the value of ICC was from 0.78 to 0.96. The SEM % of kinematics, kinetics, GRF, and sEMG ranged from (4.18-15.6), t3.31-21.82, 1.70-16.67, and 8.00-11.11 respectively. Conclusion: The three-dimensional gait analysis and sEMG systems were presented to be a reliable and valid method for measuring kinetics, kinematics, GRF and the sEMG signal during gait.