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Influence of Seating Surface Rising Trajectory on the Standing Burden in Stand-Assist Chairs

机译：座位表面上升轨迹对站立辅助椅站立负担的影响

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In this study, we fabricated two types of stand-assist chairs with different rising trajectories of the seating surface in order to reduce the burden on the user’s body when standing up from them. Then, we analyzed their resulting burden exerted when performing the upright motion. We experimentally examined the two types of chairs and compared them with an additional ordinary one. We analyzed the joint torque using a digital manikin using motion simulation software and measured the muscle activity through electromyography to evaluate the standing load by focusing on the difference in the movement characteristics between standing and upright motions. The knee joint torque associated with the proposed stand-assist chair was about 50% less than that for the ordinary one when the body was heavily loaded during the standing motion. In addition, in that case, the activity of each muscle (erector spinae muscles, vastus medialis muscle, and vastus lateralis muscle) showed the most significant decrease with the downward-arc stand-assist chair.
机译：在这项研究中，我们制造了两种类型的站立式辅助椅子，它们的坐面上升轨迹不同，目的是减轻使用者站立时的负担。然后，我们分析了他们在执行垂直运动时所产生的负担。我们通过实验检查了这两种类型的椅子，并将它们与其他普通椅子进行了比较。我们使用运动仿真软件使用数字人体模型对关节扭矩进行了分析，并通过肌电图测量了肌肉活动，通过着重于站立和直立运动之间的运动特性差异来评估站立负荷。当站立时身体沉重时，与建议的站立式辅助椅子相关的膝关节扭矩比普通椅子低约50％。此外，在这种情况下，使用弧下站立辅助椅，每条肌肉（脊柱直肌，内侧股大肌和外侧股大肌）的活动表现出最显着的下降。

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