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基于SGGC-Net动作捕捉系统解析行走步态的信度与效度

Reliability and Validity of the SGGC-Net-Based Motion Capture System for Analyzing Walking Gait
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摘要 目的以有标记点三维运动捕捉系统(Vicon)为参照标准,比较基于SGGC-Net的动作捕捉系统(SGGC-Net系统)和SIMI系统解析行走步态的信度和效度。方法招募30名健康大学生,分析其在跑步机行走时的步态特征。应用Vicon系统12台红外摄像头及4台摄像机同步采集运动学数据,获取右侧参与者肩、肘、髋、膝和踝关节三维空间角度。采用组内相关系数(intra-class correlation coefficient,ICC)及其95%置信区间和测量标准误差(standard errors of measurement,SEM)评估信度;采用多重相关系数(multiple correlation coefficients,CMC)和均方根误差(root mean square error,RMSE)评估效度。结果SGGC-Net系统解析上、下肢三维空间角度最大、最小值的ICC范围为0.798~0.990,SEM范围为0.04°~0.95°;SIMI系统的ICC范围为0.650~0.967,SEM范围为0.31°~1.24°。除髋关节最小角度和膝关节最大角度外,SGGC-Net系统解析所有角度的ICC均高于SIMI系统,且SEM均低于SIMI系统。与Vicon系统得出的上、下肢主要关节角度曲线相比,SGGC-Net系统得出的曲线CMC范围为0.945~0.996,RMSE为1.44°~4.65°;SIMI系统的CMC范围为0.815~0.986,RMSE为2.56°~9.99°。除踝关节外,SGGC-Net系统在所有角度上的CMC均大于SIMI系统,RMSE均小于SIMI系统。结论SGGC-Net系统在大多数指标中的信度和效度优于SIMI系统,其在解析行走步态时具有较好的可重复性和准确性,可适用于无标记点情境下的动作捕捉,如运动员动作技术分析与特殊人群的临床步态解析。 Objective The reliability and validity of the SGGC-Net-based motion capture system(SGGC-Net system)and SIMI system for parsing walking gait were compared using a three-dimensional(3D)motion capture system(Vicon)with marker points as a reference standard.Methods Thirty healthy college students were recruited,and their gait characteristics while walking on a treadmill were analyzed.Kinematic data were collected using the Vicon system,and video data were collected synchronously using four cameras to obtain the right shoulder,elbow,hip,knee,and ankle joint angles.Reliability was assessed using intraclass correlation coefficients(ICCs)with 95%confidence intervals and standard error of measurement(SEM).Validity was assessed using multiple correlation coefficients(MCCs)and root mean square errors(RMSEs).Results The ICCs of the maximum and minimum 3D coordinate angles of the upper and lower limb joints of the SGGC-Net system ranged from 0.798-0.990 with an SEM of 0.04°-0.95°,and the ICCs of the SIMI system ranged from 0.650-0.967,with an SEM of 0.31°-1.24°.The ICCs of the SGGC-Net system were higher than those of the SIMI system for all joint angles except for the minimum hip and maximum knee angles.Compared to the joint angle curves derived from the SIMI system,the MCCs of the curves derived from the SGGC-Net system ranged from 0.945-0.996,with RMSEs of 1.44°-4.65°,and the multiple correlation coefficients of the SIMI system ranged from 0.815-0.986,with RMSEs of 2.56°-9.99°.The MCCs of the SGGC-Net system were greater than those of the SIMI system at all angles except for the ankle joint.The RMSEs of the SGGC-Net system were smaller than those of the SIMI system at all angles except for the ankle joints.Conclusions The SGGC-Net system has better reliability and validity than the SIMI system in most of the variables,and it has better repeatability and accuracy in analyzing walking gait.It can be applied to motion capture environments without marker points,such as technical analysis of athletes’movements and clinical gait analysis of special populations.
作者 朱琳 董鹏程 沈培鑫 陈浩 孙建德 宋祺鹏 ZHU Lin;DONG Pengcheng;SHEN Peixin;CHEN Hao;SUN Jiande;SONG Qipeng(College of Graduate Education,Shandong Institute of Physical Education,Ji’nan 250100,China;College of Information Science and Engineering,Shandong Normal University,Ji’nan 250300,China)
出处 《医用生物力学》 CAS CSCD 北大核心 2024年第2期305-311,共7页 Journal of Medical Biomechanics
基金 国家自然科学基金项目(12102235)。
关键词 动作捕捉 信度 效度 关节角度 行走步态 motion capture reliability validity joint angles walking gait
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