Department of Industrial and Management Systems Engineering, Dong-A University, 840, Hadan 2-dong, Saha-gu, Busan 604-714, Korea.
Graduate School of Design, Kyushu University, 4-9-1 Shiobaru, Minami-ku, Fukuoka 815-8540, Japan.
Int J Environ Res Public Health. 2022 Aug 17;19(16):10217. doi: 10.3390/ijerph191610217.
This study investigated how sitting and standing working postures affected operation force, upper limb muscle activation, and task performance using different pointing devices. Fifteen male participants completed cursor aiming and dragging tasks using a conventional mouse, a vertical mouse, and a trackball at sitting and standing workstations. A custom-made force plate was used to measure operation forces applied to the pointing devices. Surface electromyography (EMG) was used to capture the activation of the biceps brachii, triceps brachii, deltoid, and trapezius. Task performance was measured by task success rates, and subjective ratings were obtained for the force required for operation, smoothness of operation, accuracy, and local fatigue in the upper limb. We quantified the following significant outcomes: (1) greater operation forces were found when standing; (2) standing reduced EMG amplitudes of the triceps and trapezius muscles for all tasks; (3) during the aiming task, the vertical mouse had greater operation forces; (4) during the dragging task, both the vertical mouse and trackball had greater operation forces; and (5) task success rates differed for pointing devices only when sitting. This study revealed the distinct biomechanical properties of standing working posture and suggested limited beneficial effects of alternative pointing devices in terms of task performance and subjective ratings.
本研究旨在探讨坐姿和站姿工作姿势如何影响使用不同指点设备时的操作力、上肢肌肉激活和任务表现。15 名男性参与者分别在坐姿和站姿工作站上使用传统鼠标、垂直鼠标和轨迹球完成光标瞄准和拖曳任务。使用定制的力板测量施加到指点设备的操作力。表面肌电图（EMG）用于捕获肱二头肌、肱三头肌、三角肌和斜方肌的激活情况。通过任务成功率来衡量任务表现，并对操作力、操作平滑度、准确性和上肢局部疲劳进行主观评价。我们量化了以下显著结果：（1）站立时操作力更大；（2）站立会降低所有任务中肱三头肌和斜方肌的 EMG 幅度；（3）在瞄准任务中，垂直鼠标的操作力更大；（4）在拖曳任务中，垂直鼠标和轨迹球的操作力都更大；（5）仅在坐姿时，指点设备的任务成功率会有所不同。本研究揭示了站立工作姿势的独特生物力学特性，并表明替代指点设备在任务表现和主观评价方面的有益效果有限。
