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Sang H. Kim

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Publications by Sang H. Kim (bibliography)

1995

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Chung, Min K., Kee, Dohyung and Kim, Sang H. (1995): Comparison of the Prediction Models for the L5/S1 Compressive Forces under Varying Asymmetric Lifting Conditions. In: Proceedings of the Human Factors and Ergonomics Society 39th Annual Meeting 1995. pp. 704-708.

“In this study, comparisons were made among three representative methods for predicting compressive forces on the lumbosacral disc: LP-based model, double LP-based model and EMG-assisted model. Two subjects simulated lifting tasks that were frequently performed in the refractories industry in Korea, in which vertical distance, frontal plane horizontal distance, and weight of load were varied. To calculate the L5/S1 compressive forces, EMG signals from six trunk muscles were measured and postural data were recorded using the Motion Analysis System. The EMG-assisted model was shown to reflect well all three factors considered here. On the other hand, the compressive forces of the two LP-based models were significantly affected only by weight of load. Furthermore, relatively low correlation was observed between the compressive force of the EMG-assisted model and the 1991 NIOSH lifting index (LI), while highly positive correlation was observed between that of the two LP-based models and LI.”

1994

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Kim, Sang H., Chung, Min K. and Lee, Wook G. (1994): The Effects of Task Conditions on Trunk Muscular Fatigue during Dynamic Lifting. In: Proceedings of the Human Factors and Ergonomics Society 38th Annual Meeting 1994. pp. 649-653.

“To investigate the effects of MMH task conditions on the activity and fatigue of the trunk musculature, EMG signals from eight major trunk muscles were analyzed during 120 minutes of repetitive dynamic lifting tasks. Two independent task variables were the work strategy of weight and lifting frequency combination and the body posture. The dependent variables were the amplitude of EMG signals and the amount of median power frequency (MPF) decrease over time for the eight trunk muscles. The results of the study indicated that the recruitment and the level of force exertions of the trunk muscles during manual lifting tasks are a function of the direction and the weight of the external load. The different activities of the muscles due to given task conditions also influence the fatiguing process of the individual muscle. The muscles in the dorsal part of trunk were activated during the symmetric task conditions, while the muscles on the contralateral side to the workload were more strongly activated during the asymmetric task conditions. The decreasing trends of MPF were found in some activated muscles, and they were more pronounced for the asymmetric posture than for the symmetric posture. It was also seen that the muscles became fatigued faster for light load-high frequency conditions than for heavy load-low frequency conditions.”

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