Effects of Load Position and Force Direction in One-wheeled Wheelbarrow Tasks
博士 === 國立臺灣科技大學 === 工業管理系 === 102 === The objective of the study was to explore the effects of load position and force direction on muscle activity, gripping force and rating of perceptual exertion(RPE) during wheelbarrow tasks. Nine participants were recruited to take part in the experiment. Each p...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2014
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| Online Access: | http://ndltd.ncl.edu.tw/handle/46061200570409506507 |
| Summary: | 博士 === 國立臺灣科技大學 === 工業管理系 === 102 === The objective of the study was to explore the effects of load position and force direction on muscle activity, gripping force and rating of perceptual exertion(RPE) during wheelbarrow tasks. Nine participants were recruited to take part in the experiment. Each participant performed 18 trials consisting of 2 force directions (push and pull) and 9 load positions. The dependent variables were EMG of the bilateral flexor digitourm superficialis, trapezius and erector spinae, two hand’s gripping force and RPE. Results showed that the gripping force of pushing the wheelbarrow and the scores of RPE were less than that of pulling the wheelbarrow. The Peak EMG of six muscles in the pushing task were greater than those in the pulling task. EMG was lower for the bilateral trapezius and erector spinae when the load was positioned farther from the participant. EMG of the bilateral trapezius and erector spinae increased when the weight was near the participant and on the ipsilateral hand. A similar phenomenon was also found in the gripping force of the left hand/right hand and RPE. Participants exerted greater gripping force and RPE scales when the load was set near the body than when the load was set far away from the body. Based on the results, we suggest that loads be arranged in the anterior part of the bin in order to reduce muscle activity during the wheelbarrow task. This finding also provides some directions in the improvement and ergonomic redesign of the one-wheeled wheelbarrow.
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