ERGONOMIC PARTICIPATORY INTERVENTION DECREASING FATIGUE BY REDESIGNING LADLE-KOWI

Ladel-Kowi is a manual transportation of liquid steel with 900-1200 C temperature. Unnatural working posture was revealed while operating Ladle-kowi, there was uncomfortable working movement caused by working tools design that had not been considered ergonomic rules. The exposure of high environment temperature would affect to working activities, motivation, and physical condition of workers. The objective of this research is to redesign ladle-kowi based on ergonomic participatory intervention in order to decrease fatigue of workers in metal molding industry. This research is an experimental research- treatment by subject design. Subjects are chosen by random sampling method. Total of samples is 62 workers that have meet the criteria of inclusion and exclusion. Redesign of ladle-kowi based on anthropometry data of local workers. Fatigues scores collected by 30 items of rating scales published by Japan Association of Industrial an Health. Result showed that there was significant decrease between average score of subject fatigue in P1 and P2 (p value < 0.05). Average score of fatigue before ergonomic participatory intervention was 112,61±3,84 and after ergonomic participatory intervention was 89.07±1.70, or decrease by 12.91%. The decrease of fatigue in activity aspect was 11.55%, motivation was 10.69%, and physic was 16.36%. While score of fatigue decrease consecutively based on weekdays was Monday 12.26%, Tuesday 11.39%, Wednesday 13.71% and Thursday 14.23%.