The Effect of Work Position on Fatigue on the Arm Muscles of Computer Operator

^{Authors: 1}Hendrik, ²Tjipto Suwandi, ³Harjanto JM, ⁴Hari Basuki Notobroto

¹Doctoral Program, Faculty of public Health, Airlangga University, Indonesia.

²Department of Occupational Safety & Health, Faculty of Public Health, Airlangga University, Indonesia

³Department of Physiology, Faculty of Medicine, Airlangga University, Indonesia

⁴Department of Biostatistic & Population, Faculty of Public Health, Airlangga University, Indonesia

Kampus C UNAIR, Jalan Mulyorejo, Surabaya, Indonesia; Email: padanghendrik@yahoo.co.id

Abstract

Skeletal muscle fatigue generally occurs due to excessive muscle contraction as a result of the provision of the workload is too heavy with long duration loading. Instead of muscle fatigue is not likely if muscle contractions ranged only between 15-20% of maximal muscle strength. This research aims to study the effect of various positions of the shoulder joint abduction angle to the forearm muscle fatigue computer operator. The study was designed using this type of experimental research in the field of design one group pre-posttest design. The study population was a computer operator-sex male, aged 25-40 years who worked as a computer operator. Samples are computer operators with the following criteria: minimum term of one year, weight 50-70 kg, an arm’s length 65-75 cm and height 50-70 cm, proficient typing ten fingers, long sleep at night over 6 hours, conditions fingers and arm muscles when the research was in good condition. Results of research on paired samples t test was obtained differences in the ability of muscle contraction before and after typing for 30 minutes at positions 0-200 and 41-600 both static and dynamic contraction. In the static contraction was no significant difference between the position of 0-200 and 21-400 and positions 21-400 and 41-600. In dynamic contractions were no significant differences between groups of positions 0-200 and 21-400. There is the influence of the working position against the computer operator arm muscle fatigue after working for 30 minutes, both the static and dynamic contraction.

Keywords: Working Position, Muscle Fatigue, Computer Operator.

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