| Summary: | 碩士 === 國立臺北科技大學 === 工業工程與管理系碩士班 === 102 === This study explores awkward posture effects on industrial welders by simulating welding and sanding casting parts in a kneeling and a standing posture. This laboratory study builds a human-machine interface and uses Borg CR-10 scale, electromyography (EMG), and electrocardiography (ECG) as subjective and objective indicators to quantify workload. The task workloads of 15 subjects using standing and kneeling postures were assessed and compared. Experimental results show significant lower heart rate and subjective workload in using standing posture than in using kneeling posture. While changing working posture from kneeling to standing, EMG intensities reduces significantly in bilateral erector spinae (50%ile; standing: 9.4 %MVC; kneeling: 12.2 %MVC) for both welding and sanding tasks. The EMG intensities in both side of triceps brachii are also significantly decreased in the sanding task (50%ile; standing: 5.7 %MVC; kneeling: 9.1 %MVC). However, standing posture has greater EMG intensity in bilateral gastrocnemius than kneeling posture, but the difference was only about 2 %MVC.
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