| Summary: | 碩士 === 朝陽科技大學 === 工業工程與管理系碩士班 === 95 === Much literature has provided the methods to prevent from the occupational injuries about manual material handling (MMH), but little research investigates the energy efficiency of manual material handling. Accordingly, the purpose of this study is to investigate the effects of “combination of weight and frequency” and box size on energy efficiency and various physiology responses. Sixteen young men joined this study. Six physical fitness tests were performed before lifting experiment, including a push-up for 1 min, sit-up for 1 min, sit and reach test, handling 20kg, maximum force of hand’s grip and stepping for 3 min. Three questionnaires were used to understand subjects’ fitness states. The independent variables of the lifting experiment are box size (big and small) and combination of weight and frequency (12 kg & 2 lift/min, 8 kg & 3 lift/min, 6kg & 4 lift/min, 4kg & 6 lift/min ). Dependent variables are oxgen consumption, energy efficiency, heart rate, systolic pressure, diastolic pressure, body temperature, and RPE. Three are 8 trials of lifing experiment, 16 min tasks. Subjects had to fill the form of RPE scale after each trial.We also measured their body temperature, systolic pressure and diastolic before and after each trial. Heart rate would collected during the lifting experiment.
The results indicated the combination of weight and frequency had significant effect on RPE. When the weight of box increased, RPE also increased. Some results of physical fitness tests have positive correlation with the physiology responses. We could give some suggestions for selecting the lifting workers from the results. The study found RPE has significantly postitive correlation with LI (lifting index). We could use RPE to determine safty limit for MMH. This study provided useful information for designing lifting tasks, and also assisted in elevating the energy efficiency of MMH.
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