基于表面肌电信号Wigner-Ville分布的人体膝关节力矩预测  

Prediction of Human Knee Joint Moment Based on Wigner-Ville Distribution of sEMG Signals

作　　者：许全盛[1] 李世明[2,3] 李强[2] 部义峰[4] 姜丽[3] XU Quan-sheng LI Shi-ming LI Qiang BU Yi-feng JIANG Li(Sehool of Electrical Engineering, Yanshan University, Qinhuangdao 066004, Hebei China Department of Physical Edueation, Ocean University of China, Qingdao 266100, Shandong China School of Physieal Education, Ludong University, Yantai 264025, Shandong China School of Physical Education, Jiangsu Normal University, Xuzhon 221116, Jiangsu China)

机构地区：[1]燕山大学电气工程学院,河北秦皇岛066004 [2]中国海洋大学体育系,山东青岛266100 [3]鲁东大学体育学院,山东烟台264025 [4]江苏师范大学体育学院,江苏徐州221116

出　　处：《北京体育大学学报》2016年第11期57-61,共5页Journal of Beijing Sport University

基　　金：中国博士后科学基金特别资助项目(编号:2013T60630)

摘　　要：目的:提出一种基于表面肌电信号时频分析的预测膝关节力矩的新方法。方法:受试者完成递增负重蹲起实验,采集股直肌的表面肌电信号进行时频分析,获得基于Wigner-Ville分布的表面肌电信号在时间和频率的二维平面上的能量密度,并由此估算出能够反映肌肉瞬时做功能力的敏感指标——瞬时平均频率功率。结果:以股直肌的瞬时平均频率功率和膝角为自变量,获得的二元线性回归方程可以有效预测膝关节瞬时力矩的大小。结论:表面肌电信号瞬时平均频率功率能实时反映肌肉的做功能力,可作为预测膝关节力矩和预防膝关节损伤的一个基础指标。Objective： The purpose of this paper was to propose a novel approach to predict the human knee moment based on time-frequency analysis of surface electromyography（ s EMG） signals. Methods： Subjects were enrolled to participate in incremental load squats,their s EMG signals of rectus femoris were collected and analyzed by time-frequency,and the energy density of s EMG signals on time and frequency 2D planes based on Wigner-Ville distribution was obtained,then instantaneous-mean-frequency-power（ IMFP）,a sensitive index reflects the transient capability of muscle work output was estimated. Results： The two elements linear regression equation derived from independent variables of IMFP of rectus femoris and knee angle can be used to effectively predict the knee moment. Conclusion： IMFP derived from s EMG represents the capacity of muscle＇s power output,and it can be an effective index to predict human knee moment and prevent knee injury.

关 键 词：WIGNER-VILLE分布 膝关节力矩 瞬时平均频率功率 预测 

分 类 号：G804.6[文化科学—运动人体科学]