| Summary: | 碩士 === 華梵大學 === 工業管理學系碩士班 === 91 === The purpose of this study is to explore and assess manual material handling problems involving holding tasks. A laboratory experimental study was conducted after performing a questionnaire survey. Twenty-one young male Chinese subjects were recruited to participate in experiment. The psychophysical method was used to investigate the effects of holding height and posture involving wall and below ceiling maximum acceptable holding weight(MAWH), heart rate(HR), and perceived exertion rating(RPE), respectively. Under the wall and ceiling conditions, the study results showed that the MAWH was significantly affected by height and posture. The mean HR and RPE values were significantly influenced by postures. However, the height effect on the HR and RPE values was not significant. The MAWH for over reach height was the greatest. The shoulder height effect was second, and the elbow height the smallest under the wall conditions. The MAWH for the overreach height was larger than the head height under the ceiling conditions. The MAWH with two hands was larger than that for the right hand and left hand for the posture effect. The left hand was the smallest for both the wall and ceiling conditions. Two classifications each with ten prediction models for holding capacity for both the wall and ceiling conditions were developed. These models were based on the subject’s anthropometric data, isoinertial strength and isometric strength. Both model 1, using anthropometric data (adjusted R-square 0.91with PRESS 45.78, and adjusted R-square 0.85 with PRESS 41.83 respectively) were the best. It is believed that the results of this study could be helpful in the development of employee selection, job design, and training program criteria.
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