北京生物医学工程

基于肌电信号的坐站交替模式下肌肉疲劳研究

Research on muscle fatigue in alternate sitting and standing modebased on EMG

作者：白圣亚林文文安元超张岳君柯勇伟

单位：宁波大学机械工程与力学学院（浙江宁波315211）宁波大学先进储能技术与装备研究院（浙江宁波 315211） 乐歌人体工学科技股份有限公司（浙江宁波 315191） 通信作者:林文文 E-mail: linwenwe@nbu.edu.cn

关键词：肌肉疲劳;坐站交替;肌电信号;中值频率;时间设定

分类号：R318. 04

出版年·卷·期（页码）：2022·41·1（32-37）

摘要：

目的为避免久坐对工作人员的身心造成影响,探讨在不减少工作时长的条件下采用坐站交替工作模式来替代单一作业姿势的可行性。方法通过模拟20名受试者在坐站交替模式下工作，采用调查问卷对受试者作业期间肌肉疲劳评估以及预估改变作业姿势的时间，结合肌电信号 (electromyography ,EMG)对受试者腿部腓肠肌、比目鱼肌和腰部竖脊肌进行测量并分析其各阶段中值频率的变化趋势,判定各组肌肉中值频率下降的时间点。将主观自评与肌肉疲劳分析相结合，采用聚类分析将受试者按照坐姿偏好与非偏好进行区分。结果受试者在站姿25 min时产生肌肉疲劳,45 min坐姿满意度。6分者视为偏好坐姿人群，其在坐姿50 min时产生肌肉疲劳,45 min坐姿满意度小于6分者视为非偏好坐姿人群，其在坐姿30 min时产生肌肉疲劳。结论根据不同人群的偏好合理地设置坐站交替时间可以有效地避免肌肉疲劳的累积。

Objective In order to avoid the effects of sedentary on body and mind of the staff, it is explored to use the alternate sitting and standing mode to replace sedentary without reducing the working time. Methods By simulating 20 subjects working under alternate sitting and standing mode, using questionnaires to assess the muscle fatigue of the subjects during work and estimate the time to change their working postures. The electromyography （EMG）signal of the subjects’ gastrocnemius, soleus and erector spinae were measured and analyzed the change trend of the median frequency at each stage to determine the time point at which the muscle fatigue. Combining the self-assessment with muscle fatigue analysis, subjects were classified into sitting preference and non-preference using the clustering algorithm. Results The subjects feel muscle fatigue when standing for 25 minutes. The subjects whose satisfaction ≥ 6 in the 45-minute sitting posture were considered to be a sitting preference and the sitting posture for 50 minutes. Others were considered to be a sitting non-preference and the sitting posture for 30 minutes. Conclusions Setting the alternate time between sitting and standing reasonably according to the preferences of different groups of people can avoid the accumulation of muscle fatigue effectively.

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