타이핑작업 시 수직형 키보드의 수평면 끼인각 변화에 따른 상지의 근활성도 비교

• 영문명: Comparison of Upper Extremity Muscle Activity With Transverse Plane Angle Changes During Vertical Keyboard Typing
• 발행기관: 한국전문물리치료학회
• 저자명: 이강진(Kang-jin Lee) 노정석(Jung-suk Roh) 김택훈(Tack-hoon Kim) 신헌석(Heon-seock Cynn) 최흥식(Houng-sik Choi) 오동식(Dong-sik Oh)
• 간행물 정보: 『한국전문물리치료학회지』한국전문물리치료학회지 제16권 제2호, 67~76쪽, 전체 10쪽
• 주제분류: 의약학 > 의학일반
• 파일형태: PDF
• 발행일자: 2009.05.30

영문 초록

In order to prevent upper extremity musculoskeletal disorders, effective keyboard selection is an important consideration. The aim of this study was to compare upper extremity muscle activity according to transverse plane angle changes during vertical keyboard typing. Sixteen healthy men were recruited. All subjects had a similar typing ability (rate of more than 300 keystrokes per minute) and biacromion and forearm-fingertip lengths. Four different types of keyboard (vertical keyboard with a transverse plane angle of 60°, 96°, or 120°, and a standard keyboard) were used with a wrist support. The test order was selected randomly for each subject. Surface electromyography (EMG) was used to measure upper extremity muscle activity during a keyboard typing task. The collected EMG data were normalized using the reference contraction and expressed as a percentage of the reference voluntary contraction (%RVC). In order to analyze the differences in EMG data, a repeated one-way analysis of variance, with a significance level of .05, was used. Bonferroni correction was used for multiple comparisons. There were significant differences in the EMG amplitude of all seven muscles (upper trapezius, middle deltoid, anterior deltoid, extensor carpi radialis, extensor carpi ulnaris, flexor carpi radialis, and flexor carpi ulnaris) assessed during the keyboard typing task. The mean activity of each muscle had a tendency to increase as the transverse plane angle increased. The mean activity recorded during all vertical keyboard typing was lower than that recorded during standard keyboard typing. There was no significant difference in accuracy and error scores; however, there was a significant difference between transverse plane angles of 60° and 120° with regard to comfort. In conclusion, a vertical keyboard with a transverse plane angle of 60° would be effective in reducing muscle activity compared with vertical keyboards with other transverse plane angles.

목차

Abstract

Ⅰ. 서론

Ⅱ. 연구방법

Ⅲ. 결과

Ⅳ. 고찰

Ⅴ. 결론

인용문헌

부록

키워드

Keyboard typing Muscle activity Transverse plane angle Vertical keyboard