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타이핑 작업 시 수직형 키보드의 수평면 끼인각 변화에 따른 상지의 근활성도 비교
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  • 타이핑 작업 시 수직형 키보드의 수평면 끼인각 변화에 따른 상지의 근활성도 비교
저자명
이강진,노정석,김택훈,신헌석,최흥식,오동식,Lee. Kang-Jin,Roh. Jung-Suk,Kim. Tack-Hoon,Cynn. Heon-Seock,Choi. Houng-Sik,Oh. Dong-Sik
간행물명
한국전문물리치료학회지
권/호정보
2009년|16권 2호|pp.67-76 (10 pages)
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한국전문물리치료학회
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

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 $60^{circ}$, $96^{circ}$, or $120^{circ}$, 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 $60^{circ}$ and $120^{circ}$ with regard to comfort. In conclusion, a vertical keyboard with a transverse plane angle of $60^{circ}$ would be effective in reducing muscle activity compared with vertical keyboards with other transverse plane angles.