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This study aim was to compare the computer exposure and forearm musculoskeletal symptoms among three computer use groups by an external logger. 30 participants were recruited in this study and divided into three groups: 10 computer-document (CD) processors, 10 computer-aided design (CAD) draftsmen, and 10 online gamers. Computer use of each participant was recorded for 10 consecutive days. Questionnaire survey was conducted to collect musculoskeletal complaints in participants’ upper limbs right after data collection period. Quantitative parameters computed using recorded data were daily keystrokes, mouse clicks, wheel scrolling counts, mouse movement and dragged distance. Experimental results showed that the online gamers had the significantly higher keyboard activities than typical keyboard users, CD processors. Also, it had the higher mouse activities than the typical mouse users, CAD draftsmen. However, musculoskeletal complaint in their upper limbs was not greater than that of CD processors and CAD draftsmen. There existed a complicate relationship between cumulative hazards and computer uses. Experimental results indicated that computer use duration alone could not accurately represent the workloads of various computer tasks. Adequate tools are needed for quantifying user computer exposure and providing detailed information for various computer tasks.

Comparisons of Computer Exposure and Forearm Musculoskeletal Symptoms among Three Computer Groups-The Application of an External Logger