手过头姿势下钻孔作业肌肉疲劳MET预测模型

MET prediction model of muscle fatigue in drilling with simulated overhand position

为评价手过头姿势下钻孔作业过程中人员肌肉疲劳发展情况,先通过模拟手过头姿势下的钻孔试验,测量试验前肌肉的最大随意收缩(MVC)、试验后的最大剩余肌力(MRF)、力量输出衰减程度(ΔF)以及手腕、手肘和肩部的主观疲劳评分(RPE),记录最大耐受时间(MET);通过设定3种操作面(正面、侧面、底面)和3种操作高度的不同操作组合作为试验变量,比较不同操作方式对手过头姿势下钻孔作业的肌肉疲劳影响情况,随后分析3种操作面(正面、侧面、底面)和3种操作高度下对MET、MRF、ΔF以及手腕、手肘和肩部RPE的影响。研究结果表明:采用正面操作并降低手臂上举高度能有效减轻肌肉疲劳;不同操作面显著影响MET、MRF及ΔF,同时,显著影响手腕、手肘和肩部的RPE;不同的操作高度显著影响MET、MRF以及手肘的RPE;所建立的MET预测模型可反映手过头姿势下钻孔作业过程中人员肌肉疲劳状态。

In order to evaluate the development of muscle fatigue during drilling operations in the hand-over-head posture,a simulated drilling test was conducted to measure the maximum voluntary contraction(MVC)of muscles before the test,the maximum residual muscle strength(MRF)after the test,the degree of strength output attenuation(ΔF),and ratings of perceived exertion(RPE)of wrists,elbows,and shoulders.MET was recorded.By setting different combinations of three operating surfaces(front,side,and bottom)and three operating heights as experimental variables,the effects of different operating methods on muscle fatigue during drilling operations under hand head posture were compared.Subsequently,the effects of three operating surfaces(front,side,and bottom)and three operating heights on MET,MRF,ΔF,as well as RPE of wrist,elbow,and shoulder were analyzed.Research has shown that using frontal manipulation and reducing arm lift height can effectively alleviate muscle fatigue.Different operating surfaces significantly affect MET,MRF,andΔF,as well as RPE of the wrist,elbow,and shoulder.Different operating heights significantly affect MET,MRF,and RPE of the elbow.MET prediction model established in this article can reflect the muscle fatigue status of personnel during drilling operations in the hand-head posture.