Lavender Steven A, Nagavarapu Shasank, Allread W Gary
Integrated Systems Engineering, The Ohio State University, United States; Orthopaedics, The Ohio State University, United States; Institute for Ergonomics, The Ohio State University, United States.
Integrated Systems Engineering, The Ohio State University, United States.
Appl Ergon. 2017 Jan;58:398-404. doi: 10.1016/j.apergo.2016.07.016. Epub 2016 Aug 10.
Many retail distribution centers (DCs) manually load and unload boxes into or out of trailers and shipping containers. This study investigated whether an articulating belt conveyor with a height adjustable platform, positioned at the end of an extendable conveyor, significantly reduces shoulder and back muscle loading and the spine kinematics associated with these tasks. Electromyographic and kinematic data were collected from eight volunteer employees as trailers at a shoe DC were unloaded and from nine volunteer employees as trailers at an apparel DC were loaded. Participants in this repeated measures study handled boxes with a conventional powered extendable conveyor system and with the articulating belt conveyor positioned at the end of the extendable conveyor. Bilaterally the normalized activation levels of the erector spinae and anterior deltoid muscles were reduced when loading and unloading boxes with the articulating belt conveyor. Spine movement speeds were also reduced with the articulating conveyor.
许多零售配送中心（DC）通过人工将箱子装卸到拖车和运输集装箱中或从其中取出。本研究调查了位于可伸缩输送机末端的带有高度可调平台的关节式皮带输送机是否能显著降低与这些任务相关的肩部和背部肌肉负荷以及脊柱运动学指标。在一家鞋类配送中心卸载拖车时，从八名志愿者员工身上收集了肌电图和运动学数据；在一家服装配送中心装载拖车时，从九名志愿者员工身上收集了相关数据。在这项重复测量研究中，参与者分别使用传统的动力可伸缩输送机系统以及在可伸缩输送机末端配备关节式皮带输送机来搬运箱子。使用关节式皮带输送机装卸箱子时，双侧竖脊肌和三角肌前部的标准化激活水平降低。使用关节式输送机时，脊柱运动速度也有所降低。
