Improvement of work posture to decrease musculoskeletal disorder and increase work productivity jewelry worker in bali
Finishing process of workmanship on jewel stone at small scale industry of jewelry crafting in Bali was polishing. This process was done manually by working posture were cross-legged sitting on the floor. This awkward working posture (cross-legged sitting) caused more musculoskeletal disorder (MSD) special on the arm, waist, and low back pain. The MSD problem can decrease production. To solve these problems and increase productivity, the improvement of work posture should done by ergonomics approach. The research was conducted on 12 jewel craftsmen by "treatment by subject design". Work load was measured by using work heart rate which was count using ten pulses methods. Musculoskeletal disorders were assessed by Nordic Body Map questionnaire. And work productivity was assessed by amount of product per pulse rate. The data were analysed by using t-pair test at significant level 5%. Results of this reserach showed that there was significant different (p < 0.05) of work load, MSD, and work productivity betwen befere improvement and after improvement. Work load decrease11,8%, MSD decrease 30,4%, and work productivity increase 38,7%. Its can be concluded that inprovement of work posture decreased of work load and musculoskeletal disorders and increased of productivity of jewel workers. That is why, it was recommended the improvement of work posture should be used by workmanship the jewel stone and ergonomics work station.