Study on muscle fatigue characteristics of drilled workers in confined space

doi:10.16265/j.cnki.issn1003-3033.2019.03.013

Abstract

Abstract: In order to study the muscle fatigue characteristics of drilling workers in confined spaces, the sEMG of ten muscles such as splenius cervicis and thoracolumbar fascia was measured under standing posture, semi-squatting posture and full knee posture through the simulation experiments. Using the MF as an indicator, the fatigue degree of each muscle was evaluated according to the MF reduction rate, and different time gradients were set to compare the change of fatigue degree, thereby proposing a solution to reduce muscle fatigue. The experimental results show that the deeper the muscle fatigue degree is, the faster the MF declines, that the waist shows a high rate of decline (0.374±0.129) in all three postures, that the drop rate (0.60) of the neck is higher in the standing position and the drop rate (0.55) of tibial muscle is higher in the kneeling position, and that the adjustment of the working cycle can reduce the MF value by 1.33-9.85 times and effectively reduce fatigue.

Key words: confined space, homework posture, muscle fatigue, surface electromyography(sEMG), median frequency(MF)

CLC Number:

X912.9

XU Sheng, JIN Longzhe, XU Mingwei. Study on muscle fatigue characteristics of drilled workers in confined space[J]. China Safety Science Journal, 2019, 29(3): 76-81.

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