速度及负荷对动态拉力作业肌肉疲劳影响建模

Modeling effect of walking speed and load on muscular fatigue for dynamic tension work

为探究速度、负荷对动态拉力作业肌肉疲劳发展的影响,构建描述动态拉力作业肌肉疲劳发展的预测模型,设计动态拉力作业模拟试验;招募10名男性大学生作为被试,并测量试验前后的最大随意收缩(MVC)、最大耐受时间(MET)以及记录身体多个部位的主观疲劳评分(RPE);探讨速度和负荷对拉力变化、MET和RPE的影响,并基于试验数据构建MET预测模型。结果表明:速度显著影响MET、拉力衰减值(ΔF)、拉力衰减程度(DFD)以及多个部位的RPE,负荷仅显著影响MET;所建预测模型能描述MET与负荷强度、行走速度之间的关系,且相较其他MET预测模型,其偏差最小,更适用预测和评估动态拉力作业人员肌肉疲劳。

In order to investigate effect of walking speed and load on muscular fatigue for dynamic tension work,and models for predicting muscular fatigue was constructed,a simulated dynamic truck pulling work was designed and 10 male college students were recruited as participants. Then,MVC before and after the test and MET were measured,and RPE of multiple body parts were recorded,effects of speed and load on variation of tension, MET and RPE was investigated. Also, predict MET model was constructed based on data. The results show that walking speed affects MET,tension attenuation value( ΔF),DFD and RPE for multiple parts of body significantly,while load effect MET remarkably.Prediction model is reasonable to describe relationships between MET and load intensity and walking speed,and had a lower deviation between prediction values and actual values when compared with other MET prediction models. It was more suitable for prediction and assessment of muscular fatigue in dynamic truck pulling task.