有限空间环境下颈部侧屈肌肉受力与疲劳特征

Stress and fatigue characteristics of neck muscles in lateral flexion posture in confined space

近年来肌肉骨骼损伤已成为我国防控职业病的重点问题之一,为降低职业性肌肉疾病发病率,首先,通过AnyBody平台建立颈部骨肌模型,并进行逆向动力学仿真分析,得到颈部侧屈姿势下肌肉的受力情况;然后,选取8名健康被试,运用表面肌电(s EMG)技术采集胸锁乳突肌和斜方肌的肌电信号,使用中值频率(MF)作为指标,根据MF下降速率评定肌肉的疲劳程度;最后,通过设置不同的温湿度环境,探究有限空间高温高湿环境对于颈部肌肉疲劳的影响。结果表明:随着侧屈角度的增加,颈部肌肉承担的负荷在逐渐增大,疲劳发生速度变快;同时,高温高湿作业环境也会加快侧屈姿势下颈部肌肉的疲劳速度。

In order to reduce incidence of occupational muscular disorders since musculoskeletal injury has become one of the key problems in prevention and control of occupational diseases in China,firstly,a neck musculoskeletal model was established by AnyBody platform,and stress of muscles in lateral flexion position of neck was obtained through reverse dynamics simulation analysis.Then,8 healthy subjects were selected,electromyographic signals of their sternocleidomastoid and trapezius muscles were collected with s EMG technology,and median frequency(MF)was used as an indicator to assess muscle fatigue based on MF decline rate.Finally,by setting up different temperature and humidity,effects of high temperature and humidity environment in confined space on neck muscle fatigue were investigated.The results show that with the increase of lateral flexion angle,load of neck muscles is increasing gradually,and fatigue rate becomes faster.At the same time,high temperature and humidity working environment will also accelerate fatigue of neck muscles under lateral flexion posture.