Work Position Effects On Physiological Aspects Of Machining Workers

In this research a procedure to evaluate the physiological-based machining workers working position has been developed using cross-sectional as Observational study design. The method applied is observation, interview and measuring. The subjects of research are practicing students amounting to 21 students with average ages of 19.5 ± 0.67. Body mass index on the average of 21.33 ± 2.13, considering normal. Referring to the analysis of statistical test of Wilcoxon Signed Ranks Test, the difference of effect of work position is significant, namely p<0.05 towards musculoskeletal disorders (MSDs) before and after working. The quantity of the average complaint after working is 44.52 ± 9.28. The musculoskeletal complaint is felt 100% on skeletal muscles with details as follows: (a) 76% is waist ache; (b) 71% left tarsus ache; (c) 67% back pain; (d) 62% felt stiff on upper neck, lower neck and left calf ache. The result of Wilcoxon Signed Rank Test shows that there is significant different effects of standing work position, namely p<0.05 towards fatigue generally before and after working. The degree of fatigue effects is on the average of 100% of practicing students feel tired. Based on the questionnaire, 30 items of general fatigue are grouped into 3 (three), namely: (a) Question group 1 – 10 shows the attenuation of activity of 77%; (b) questions 11-20 show the attenuation of motivation of 86% and; (c) questions 21-30 show the description of general physical fatigue of 53 %. The degree of working pulse is on the average of 110.00 ± 10.44 ppm (pulse per minute) which can be categorized into the medium workload. By means of Paired t test, the result is p<0.005. The concentration, consisted of the speed, correctness and Constance also will be decrease each 15.23%, 11.20% and 16.33%. It shows that there is a significant difference of standing work position effect towards the musculoskeletal disorders, fatigue, workload and concentration when having a rest and working of the practicing students. The efforts of working station repair, short term-rest and supplying drinking water are able to decrease musculoskeletal disorders, fatigue, work load and increase concentration as well as increase the work productivity.