| Summary: | 碩士 === 朝陽科技大學 === 工業工程與管理系碩士班 === 97 === Manual materials handling (MMH) is one of the most common activities in industries.The load distribution of objects are often unbalanced in lifting tasks. Compared with the lifting tasks with unbalanced load, there are few studies on biomechanical behavior of upper limbs in the literature. The purpose of this study is to explore the biomechanical behavior of upper limbs for the lifting task with unbalanced load distribution and different lifting time.
In this study, an experiment was conducted to collect the biomechanical behavior of upper limbs in the laboratory where two 3-component force transducers and EMG system were executed. Fifteen subjects were recruited and 15 task patterns, which were the combinations of 5 load distributions, 3 lifting periods (1s/lift, 2s/lift and 3s/lift), were designed and performed in the experiment.
The experiment results showed that the muscular exertions of upper limbs were higher when the load contribution of objects lifted was not balanced. It’s recommended that the load contribution of objects should be balanced while lifting. The lifting periods had the significant effect on the biomechanical behavior of upper limbs. The hand exertion and the %MVC of tested muscles become larger when the lifting period was short, implying that the risk of musculoskeletal disorders would be higher when fast lifting was performed.
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