Assessment of the Upper Limb Work Load according to the Mouse Size in VDT Tasks

컴퓨터 작업에서 마우스 종류에 따른 상완 부하 평가

  • Song, Young-Woong (Department of Occupational Health, Catholic University of Daegu) ;
  • Kim, Kyoung-Ah (Department of Occupational Health, Catholic University of Daegu)
  • 송영웅 (대구가톨릭대학교 산업보건학과) ;
  • 김경아 (대구가톨릭대학교 산업보건학과)
  • Received : 2011.06.23
  • Accepted : 2011.07.23
  • Published : 2011.09.01


The objective of this study was to determine whether there are differences in hand muscle activities (APB : abductor pollicis brevis, ED : extensor digitorum, ECU : extensor carpi ulnaris, and EI : extensor indicis) and subjective discomfort according to the three mouse sizes (small, medium, large) and two task types (pointing and scrolling). The mouse size and task type showed significant interaction effects on the total NEMG (p = 0.004) and on the NEMG of the abductor pollicis brevis muscle (p = 0.001). The total NEMG and the NEMG of APB showed the highest value in the 'scrolling' task using the 'small' mouse. However, the NEMG of the EI was different according to the mouse size, and the 'small' mouse showed the lowest value. The subjective discomfort was the lowest in the 'medium' mouse, and all nine subjects preferred the 'medium' size. The hand-size related anthropometric variables showed different correlations according to the task type and mouse size with the NEMGs and subjective discomfort. The results of this study could be used as a basic information for the determination of the proper mouse size according to the hand size.


Supported by : 대구가톨릭대학교


  1. Fahrbach, P. and Chapman, L. (1990), VDT Work Duration and Musculoskeletal Discomfort, AAOHN Journal, 28(1), 32-36.
  2. Gustafsson, E. and Hagberg, M. (2003), Computer Muse Ue in To Dfferent Hand Positions : Exposure, Comfort, Exertion and Productivity, Applied Ergonomics, 34, 107-113.
  3. Hedge, A. and Powers, J. R. (1995), Wrist Postures while Keyboarding : Effects of a Negative Slope Keyboard System and Full Motion Forearm Supports, Ergonomics, 38, 508-517.
  4. Jensen, C., Borg, V., Finsen, L., Hansen, K., Juul-Kristensen, B., and Christensen, H. (1998), Job Demands, Muscle Activity and Musculoskeletal Symptoms in Relation to Work with the Computer Mouse, Scnd. J. Environ. Health, 24(5), 418-424.
  5. Karlqvist, L., Hagberg, M., and Selin, K. (1994), Variation in Upper Limb Posture and Movement during Word Processing with and without Mouse Use, Ergonomics, 37(7), 1261-1267.
  6. Keir, P., Bach, J., and Rempel D. (1999), Effects of Computer Mouse Design and Task on Carpal Tunnel Pressure, Ergonomics, 42(10), 1350-1360.
  7. Lee, D., Cheon, J., Park, J., and You, H. (2010), Task Performance, EMG and Subjective Discomfort according to the Mouse Type during Computer Tasks, Proceedings of the Korean Ergonomics Society 2010 Spring Meeting, 371-376.
  8. Song, J., Lee, S., Rho, S., Ryu, S., Kim, H., and Park, S. (2003), Work related Upper-extremity Musculoskeletal Disorders among Visual Display Terimnal (VDT) Users in a Telecommunication Company in Seoul, Korea, The KJAsEM, 13(1), 37-44.
  9. Yim, S. H., Lee, Y. G., Cho, J. J., Son, J. I., and Song, J. C. (1997), Symptom Prevalence of Work-related Musculoskeletal Disorders and Related Factors among Bank Workers by Visual Display Terminal Use, Korean Journal of Occupational Medicine, 9(1), 85-98.