Effect of computer keyboard slope on wrist position and forearm electromyography of typists without musculoskeletal disorders

Physical Therapy

Volumn 83, Issue 9, 2003, Pages 816-830

  Simoneau, Guy G ^a   Marklin, Richard W ^b   Berman, Joseph E ^a  

^a MARQUETTE UNIVERSITY   (United States)

^b Marquette University   (United States)

Author keywords

Computer keyboard; Slope angle; Typing; Wrist angle; Wrist extension

Indexed keywords

ADULT; ARTICLE; BIOMECHANICS; CARPAL TUNNEL SYNDROME; CONTROLLED STUDY; ELECTRODE; ELECTROMYOGRAPHY; ERGONOMICS; FATIGUE; FEMALE; FINGER; FOREARM; GONIOMETRY; HIGH RISK POPULATION; HUMAN; HUMAN EXPERIMENT; JOINT FUNCTION; MALE; MUSCULOSKELETAL DISEASE; NORMAL HUMAN; OCCUPATIONAL HAZARD; PSYCHOPHYSICS; RISK ASSESSMENT; ULNA; WRIST; ANALYSIS OF VARIANCE; BODY POSTURE; COMPUTER TERMINAL; EQUIPMENT DESIGN; JOINT CHARACTERISTICS AND FUNCTIONS; METHODOLOGY; MIDDLE AGED; OCCUPATIONAL DISEASE; PHYSIOLOGY; RISK FACTOR; SKELETAL MUSCLE;

ADULT; ANALYSIS OF VARIANCE; BIOMECHANICS; CARPAL TUNNEL SYNDROME; COMPUTER TERMINALS; ELECTROMYOGRAPHY; EQUIPMENT DESIGN; FEMALE; FOREARM; HUMANS; MALE; MIDDLE AGED; MUSCLE, SKELETAL; OCCUPATIONAL DISEASES; POSTURE; RANGE OF MOTION, ARTICULAR; RISK FACTORS; WRIST JOINT;

EID: 0141800018     PISSN: 00319023     EISSN: None     Source Type: Journal    
DOI: 10.1093/ptj/83.9.816     Document Type: Article

References (30)

1. Tittiranonda P, Burastero S, Rempel D. Risk factors for musculoskeletal disorders among computer users. Occupational Medicine: State of the Art Reviews. 1999;14:17-38.
2. Kroemer KHE. Human engineering the keyboard. Human Factors. 1972;14:51-63.
3. Marklin RW, Simoneau GG, Monroe JF. Wrist and forearm posture from typing on split and vertically-inclined computer keyboards. Human Factors. 1999;41:559-569.
4. Simoneau GG, Marklin RW, Monroe JF. Wrist and forearm posture of users of conventional computer keyboards. Human Factors. 1999;41:413-424.
5. Gerard MJ, Armstrong TJ, Franzblau A, et al. The effects of keyswitch stiffness on typing force, finger electromyography, and subjective discomfort. Am Ind Hyg Assoc J. 1999;60:762-769.
6. Fernstrom E, Ericson MO, Malker H. Electromyographic activity during typewriter and keyboard use. Ergonomics. 1994;37:477-484.
7. Simoneau GG, Marklin RW. Effect of computer keyboard slope and height on wrist extension angle. Human Factors. 2001;43:287-298.
8. Rempel D, Kier PJ, Smutz WP, Hargen A. Effects of static fingertip loading on carpal tunnel pressure. J Orthop Res. 1997;15:422-426.
9. Schoenmarklin RW, Marras WS. A dynamic biomechanical model of the wrist joint. In: Proceedings of the 34th Annual Meeting of the Human Factors Society. Orlando, Fla: Human Factors and Ergonomics Society; 1990:805-809.
10. Kier PJ, Bach JM, Rempel DM. Effects of finger posture on carpal tunnel pressure during wrist motion. J Hand Surg [Am]. 1998;23:1004-1009.
11. Lieber RL, Friden J. Musculoskeletal balance of the human wrist elucidated using intraoperative laser diffraction. J Electromyogr Kinesiol. 1998;8:93-100.
12. Loren GJ, Shoemaker SD, Burkholder TJ, et al. Human wrist motors: biomechanical design and application to tendon transfers. J Biomech. 1996;29:331-342.
13. Durkan JA. A new diagnostic test for carpal tunnel syndrome. J Bone Joint Surg Am. 1991;73:535-538.
14. Gellman H, Gelberman RH, Tan AM, Botte MJ. Carpal tunnel syndrome: an evaluation of the provocative diagnostic tests. J Bone Joint Surg Am. 1986;68:735-737.
15. Martin B, Rempel D, Sudarsan P, et al. Accuracy of surface EMG to assess forearm muscle load during typing. In: Proceedings of the Marconi Research Conference; Marshall, Calif; December 11-14, 1998. Marshall, Calif: Marconi Conference Center; 1998:55-60.
16. Martin B, Rempel D, Sudarsan P, et al. Reliability and sensitivity of methods to quantify muscle load during keyboard work. In: Proceedings of the Marconi Research Conference; Marshall, Calif; December 1997. Marshall, Calif: Marconi Conference Center; 1997:40-42.
17. Jacobson M, Rempel D, Martin B, et al. Comparison of fine wire to surface EMG amplitude of finger muscles during precision tasks. In: Proceedings of the Marconi Research Conference; Marshall, Calif; December 11-14, 1998. Marshall, Calif: Marconi Conference Center; 1998:49-54.
18. Portney LG, Watkins MP. Foundations of Clinical Research: Applications to Practice. 2nd ed. Upper Saddle River, NJ: Prentice-Hall Health; 2000.
19. Shrout PE, Fleiss J. Intraclass correlations: uses in assessing rate reliability. Psychol Bull. 1979;86:420-428.
20. Soderberg G, Blanco M, Cosentino T, Kurdelmeier K. An EMG analysis of posterior, trunk musculature during flat and anteriorly inclined sitting. Human Factors. 1986;28:483-491.
21. Neumann D, Cook T, Sholty R, Sobush D. An electromyographic analysis of hip abductor muscle activity when subjects are carrying loads in one or both hands. Phys Ther. 1992;72:207-217.
22. Basmajian JV, Blumenstein R. Electrode Placement in EMG Biofeedback. Baltimore, Md: Williams & Wilkins; 1980.
23. American National Standard for Human Factors Engineering of Visual Display Workstations. Santa Monica, Calif: Human Factors Society Inc; 1988. American National Standards Institute/Human Factors Society Standard No. 1001988.
24. Marklin RW, Simoneau GG. Effect of setup configurations of split computer keyboards on wrist angle. Phys Ther. 2001;81;1038-1048.
25. Hedge A, Powers JR. Wrist postures while keyboarding: effects of a negative slope keyboard system and full motion forearm supports. Ergonomics. 1995;38:508-517.
26. Armstrong TJ, Chaffin DB. Some biomechanical aspects of the carpal tunnel. J Biomech. 1978;12:567-570.
27. Armstrong TJ, Chaffin DB. An investigation of the relationship between displacements of the finger and wristjoints and the extrinsic finger flexor tendons. J Biomech. 1978;11:119-128.
28. Strasser H, Keller E, Muller KW, Ernst J. Local muscular strain dependent on the direction of horizontal arm movements. Ergonomics. 1989;32:899-910.
29. Jonsson B. Measurement and evaluation of local muscular strain in the shoulder during constrained work. Journal of Human Ergology. 1982;11;73-88.
30. Jensen BR, Laursen B, Sjogaard G. Aspects of shoulder function in relation to exposure demands and fatigue: a mini review. Clin Biomech. 2000;15(suppl 1):S17-S20.