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

doi:10.16265/j.cnki.issn1003-3033.2020.06.026

Abstract

Abstract: 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 sEMG 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.

Key words: confined space, lateral flexion of neck, hot and humid environment, muscle fatigue, surface electromyography(sEMG)

CLC Number:

X912

ZHANG Yihong, JIN Longzhe, XU Mingwei, WEI Yixuan. Stress and fatigue characteristics of neck muscles in lateral flexion posture in confined space[J]. China Safety Science Journal, 2020, 30(6): 178-184.

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