ISSN: 1985-3157 Vol. 7 No. 1 January-June 2013 Electromyography Analysis Associated with Prolonged Standing in Metal Stamping Industry 15 ELECTROMYOGRAPHY ANALYSIS ASSOCIATED WITH PROLONGED STANDING IN METAL STAMPING INDUSTRY Isa, H. *1 , Omar, A.R. 2 , Ismail, A. R. 3 , Seri, R.K. 1 , Hambali, A. 1 , Rahman, M.A. 1 , and Rohana, A. 4 1 Faculty of Manufacturing Engineering, Universiti Teknikal Malaysia Melaka, Durian Tunggal, 76100 Melaka, Malaysia. 2 Faculty of Mechanical Engineering, Universiti Teknologi MARA, 40000 Shah Alam, Selangor, Malaysia. 3 Faculty of Mechanical Engineering, Universiti Malaysia Pahang, 26600 Pekan, Pahang, Malaysia. 4 Faculty of Engineering Technology, Universiti Teknikal Malaysia Melaka, Durian Tunggal, 76100 Melaka, Malaysia. Email: *1 isa@utem.edu.my; 2 aro@salam.edu.my; 3 arasdan@gmail.com; 1 seri@utem.edu.my; 4 rohana_abdullah@utem.edu.my ABSTRACT: Many jobs in metal stamping industry require workers to perform in standing position. Standing is a practical working position when the workers are lifing heavy products, and pushing or pulling excessive loads because those jobs require a stable position and large degree of freedom. However, if the workers perform the jobs continuously in standing throughout the working hours, they may be experience muscle fatigue. The objective of this study such as to measure the myoelectric levels (μV) exerted by the lef and right erector spinae, lef and right tibialis anterior. The myoelectric levels in the muscles were measured using surface Electromyography (sEMG). Ten production workers from a metal stamping industry participated as subjects for sEMG measurement. Out of which, fve workers from metal stamping process lines and another fve from handwork section. The muscle activity of the subjects was measured for 5 hours and 45 minutes of continuous standing during beginning of workday, middle of workday, and end of workday from Monday to Wednesday. Results of comparison found that the two groups of workers show signifcant diference (p-value < 0.05) in myoelectric level in the right erector spinae, right gastrocnemius, and lef tibialis anterior during the beginning of workday. However, the two groups of workers did not show any signifcant diference in myoelectric level during the middle of the workday and end of the workday. It can be concluded that muscle activity of the workers