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Journal of the Korean Academy of Rehabilitation Medicine 2002;26(4):461-469.
The Desk Height and Keyboard Design as Determinants of Posture and Trapezius Tension.
Kim, Min Wook , Cho, Soo Hun , Han, Tai Ryoon , Chung, Sun Gun , Lee, Kyung Woo
1Department of Rehabilitation Medicine, Catholic University College of Medicine, Korea.
2Department of Preventive Medicine, Seoul National University College of Medicine, Korea.
3Department of Rehabilitation Medicine, Seoul National University College of Medicine, Korea.
4Department of Rehabilitation Medicine, Dong-A University College of Medicine, Korea.
책상 높이와 키보드 디자인에 따른 상지 자세 및 승모근 긴장의 변화
김민욱, 조수헌1, 한태륜2, 정선근2, 이경우3
가톨릭대학교 의과대학 재활의학교실, 서울대학교 의과대학 1예방의학교실, 2재활의학교실, 3동아대학교 의과대학 재활의학교실
Abstract

Objective
To test the hypothesis that changing the desk height or keyboard design with fixed neck posture will change posture of the upper extremity and the trapezius tension, and to suggest the appropriate the desk height and the keyboard design to relieve the tension of the trapezius.


Method
Five men volunteered. Four desk heights (5 cm below, same as, 5 cm above, 10 cm above the olecranon) and three keyboard designs (flat, wrist support, natural) were set up. The posture of the upper extremity was analysed by 3 dimensional Ariel performance analysis system. The tension of trapezius was measured by surface EMG.


Results
The trapezius tension was low when the desk height was below the olecranon in 'flat' keyboard, and was low when the desk height was no higher than 5 cm above the olecranon in 'wrist support' and 'natural' keyboard. The trapezius tension went with the change of the shoulder flexion, abduction, elevation and the elbow flexion in 'flat' keyboard, and went with the change of the shoulder flexion and elevation in 'wrist support' and 'natural' keyboard.


Conclusion
To lessen the tension of the trapezius, the desk height should be below the olecranon in 'flat' keyboard and no higher than 5 cm above the olecranon in 'wrist support' and 'natural' keyboard. The keyboard design should include the wrist support which relieved the tension of trapezius by giving the resting point. (J Korean Acad Rehab Med 2002; 26: 461-469)

Key Words: Work-related musculoskeletal disorder, Keyboard, Height, Design, Trapezius
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