Physical Activity and Human Performance Group, Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7, Bldg. D-3, DK 9220 Aalborg East, Denmark; MimeTIC, IRISA-INRIA Rennes, Campus de Beaulieu, 35042 Rennes Cédex, France; Département mécatronique, ENS Cachan Antenne de Bretagne, 35170 Bruz Cédex, France.
Physical Activity and Human Performance Group, Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7, Bldg. D-3, DK 9220 Aalborg East, Denmark.
Appl Ergon. 2014 May;45(3):592-600. doi: 10.1016/j.apergo.2013.08.003. Epub 2013 Aug 22.
This study assessed the capacity of a musculoskeletal model to predict the relative muscle activation changes as a function of the workbench height and the movement direction during a simulated meat cutting task. Seven subjects performed a cutting task alternating two cutting directions for 20 s at four different workbench heights. Kinematics, electromyography (EMG), and cutting force data were collected and used to drive a musculoskeletal model of the shoulder girdle. The model predicted the muscle forces exerted during the task. Both the recorded and computed activation of the muscles was then compared by means of cross-correlation and by comparison of muscle activation trends with respect to the workstation parameters, i.e. cutting direction and workbench height. The results indicated that cutting movements involving arm flexion are preferable to movement requiring internal arm rotation and abduction. The optimal bench height for meat cutting tasks should be between 20 and 30 cm below the worker's elbow height. The present study underlines a beneficial use of musculoskeletal models for adjusting workstation parameters.
本研究评估了肌肉骨骼模型预测相对肌肉激活变化的能力，这些变化是作为模拟切肉任务中工作台高度和运动方向的函数。七名受试者在四个不同的工作台高度下进行了 20 秒的交替两种切割方向的切割任务。收集运动学、肌电图 (EMG) 和切割力数据，并用于驱动肩部的肌肉骨骼模型。该模型预测了任务期间施加的肌肉力。通过互相关和相对于工作站参数（即切割方向和工作台高度）比较肌肉激活趋势，比较记录和计算的肌肉激活。结果表明，涉及手臂弯曲的切割运动比需要内部手臂旋转和外展的运动更可取。用于切割任务的最佳工作台高度应为工人肘部高度以下 20 至 30 厘米。本研究强调了肌肉骨骼模型在调整工作站参数方面的有益用途。
