Eight Hours Actual Lowering Behavior for Porters under the Pay-By-Weight Rewarding System

• Main Authors: Chang, Shu-Wei, 張修維
• Other Authors: Ho, Cheng-Pin
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/86448315277676922934

碩士 === 國立屏東科技大學 === 工業管理系所 === 96 === The purpose of the study is to investigate the actual 8 hours lowering behavior of porters under the pay-by-weight rewarding system. When workers perform MMH activities, they will adjust their behavior according to their body conditions from time to time, thus produce different results. MMH activities usually contain lifting and lowering behavior; these two kinds of behavior involve different muscles and different muscle endurance. In order to investigate the actual lowering behavior and to compare it with lifting behavior, 6 male subjects with MMH experience were recruited and were asked to perform 8 hours lowering. Two Psychophysical experiments were conducted to decide the maximum acceptable weight of lowering (MAWLo) and maximum acceptable lowering frequency (MALoF). The research revealed that the length of working hours had significant influence on the lowering frequency, total lowering weight and counts. Furthermore, while the time increased, the values of the above variables decreased. After 8 hour actual lowering activity, the lower back was the body part with the severest and the hardest-to-recover fatigue because of continual stooping. Through the psychophysical experiments, the MAWLo has been overestimated in the lowering weight of every time and the lowering weight of ending. The MALoF has been underestimated in the lowering frequency, but are similar to the lowering frequency that the subjects are working. Comparing with another research on the eight hours actual lifting behavior, the research revealed that the total lowering weight and frequency was higher than the total lifting weight and frequency, but there was no difference in the weight workers lift/lower everytime. Therefore, lifting is limiting activity for designing MMH task instead of lowering.