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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

Abstract

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.

Acknowledgement

Supported by : 대구가톨릭대학교

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