타이핑작업 시 수직형 키보드의 수평면 끼인각 변화에 따른 상지의 근활성도 비교
Comparison of Upper Extremity Muscle Activity With Transverse Plane Angle Changes During Vertical Keyboard Typing
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Abstract
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.
참고문헌 (27)
- 강도기, "키보드 타이핑 작업 시 팔뚝 지지방법에 따른 근활성도 비교", 석사, pp.2006
- 김민욱, "키보드 높이와 디자인에 따른 상지의 자세 변화와 승모근 긴장에 관한 연구", 석사, pp.2000
- 김효준, "근골격계질환 예방을 위한 마우스 작업의 손목지지대 개선", 석사, pp.2006
- 우영근, "정상성인에게 정적 균형 제어시 다양한 조건에 따른 하퇴 근육 활성도의 특성", 한국전문물리치료학회지, 11(2), pp.35~46 (2004), 한국전문물리치료학회
- 노동부, "영상표시단말기(VDT) 취급근로자 작업관리지침", 2~11 (2004)
- 도널드뉴만, "근골격계의 기능해부 및 운동학", pp.241~243 (2004), 정담미디어
- 손민균, "전완의 자세에 따른 회외, 회내의 힘과 근전도 활성도", Annals of Rehabilitation Medicine, 26(4), pp.432~438 (2002), 대한재활의학회
- 송영무, "미적분학", pp.133~138 (1996), 경문사
- 정병권, "컴퓨터 키보드의 경사도가 정중신경의 잠복시와 단무지외전근의 긴장도에 미치는 영향", 석사, pp.2004
- 최정화, "인간공학적 키보드의 수행도 및 자세 평가에 관한 연구", 한국안전학회지, 14(4), pp.168~175 (1999)
- 이경화, "한국과 미국 성인의 3차원 인체 치수 비교", 한국의류학회지, 31(6), pp.892~901 (2007), 한국의류학회
- Barr AE, "Testing apparatus and experimental procedure for position specific normalization of electromyographic measurements of distal upper extremity musculature", Clin Biomech (Bristol, Avon), 16(7), pp.576~585 (2001)
- Cook C, "The effect of upper extremity support on upper extremity posture and muscle activity during keyboard use", Appl Ergon, 35(3), pp.285~292 (2004)
- Duncan J, "Keyboard operating posture and symptoms in operating", Ergonomics, 15, pp.651~662 (1974)
- Fagarasanu M, "Measurement of angular wrist neutral zone and forearm muscle activity", Clin Biomech (Bristol, Avon), 19(7), pp.671~677 (2004)
- Fujii H, "Co-contraction of the pronator teres and extensor carpi radialis during wrist extension movements in humans", J Electromyogr Kinesiol, 17(1), pp.80~89 (2007)
- Gilad I, "Muscular effort in four keyboard designs", Int J Ind Ergon, 26(1), pp.1~7 (2000)
- Hansson GA, "Sensitivity of trapezius electromyography to differences between work tasks-influence of gap definition and normalization methods", J Electromyogr Kinesiol, 10(2), pp.103~115 (2000)
- Hedge A, "Wrist postures while keyboarding: Effects of a negative slope keyboard system and full motion forearm supports", Ergonomics, 38(3), pp.508~517 (1995)
- Kreulen M, "Assessment of flexor carpi ulnaris function for tendon transfer surgery", J Biomech, 41(10), pp.2130~2135 (2008)
- Marklin RW, "Effect of setup configurations of split computer keyboards on wrist angle", Phys Ther, 81(4), pp.1038~1048 (2001)
- Marklin RW, "Wrist and forearm posture from typing on split and vertically inclined computer keyboards", Hum Factors, 41(4), pp.559~569 (1999)
- Schoenmarklin RW, "A dynamic biomechanical model of the wrist joint", Proceedings of the 34th Annual Meeting of the Human Factors Society, pp.805~809 (1990), Human Factors and Ergonomics Society
- Simoneau GG, "Effect of computer keyboard slope on wrist position and forearm electromyography of typists without musculoskeletal disorders", Phys Ther, 83(9), pp.816~830 (2003)
- Szeto GPY, "EMG median frequency changes in the neck-shoulder stabilizers of symptomatic office workers when challenged by different physical stressors", J Electromyogr Kinesiol, 15(6), pp.544~555 (2005)
- van Galen GP, "Effects of a vertical keyboard design on typing performance, user comfort and muscle tension", Appl Ergon, 38(1), pp.99~107 (2007)
- Won EJ, "Upper extremity biomechanics in computer tasks differ by gender", J Electromyogr Kinesiol, 19(3), pp.428~436 (2009)