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Examining the low, high and range measures of muscle activity amplitudes in symptomatic and asymptomatic computer users performing typing and mousing tasks.
- Source :
-
European Journal of Applied Physiology . May2009, Vol. 106 Issue 2, p243-251. 9p. 1 Chart, 5 Graphs. - Publication Year :
- 2009
-
Abstract
- Past studies on work-related musculoskeletal disorders (WMSD) have reported increased median muscle activities in terms of 50th% of amplitude probability distribution function (APDF), and this was thought to be a manifestation of altered motor control--an important mechanism contributing to WMSD. The present study aimed to examine whether such altered motor control was also present in other parameters of APDF--the 10th and 90th% values, which can be considered indicators of the low and high measures of muscle activity. The difference between 10th and 90th% APDF can be considered an indicator of the variation in muscle activity amplitude (the "APDF range"). Surface electromyography was examined in female office workers as Case (n = 21) and Control (n = 18) subjects. The APDF variables were measured in cervical erector spinae (CES) and upper trapezius (UT) muscles during typing, mousing and type-and-mouse, for 20 min each. The Case Group had significantly higher CES activity in the 10th, 90th% and APDF range compared to Controls. The UT muscles showed similar trends but the between-group differences were not statistically significant. These results have demonstrated the robustness of the APDF variables as sensitive indicators of motor control variations in symptomatic subjects with musculoskeletal disorders. [ABSTRACT FROM AUTHOR]
- Subjects :
- *MUSCULOSKELETAL system diseases
*COMPUTER users
*KEYBOARDING
*ETIOLOGY of diseases
*MOTOR ability
*MEDICAL research
*NECK muscles
*COMPARATIVE studies
*COMPUTERS
*ELECTROMYOGRAPHY
*RANGE of motion of joints
*KINEMATICS
*RESEARCH methodology
*MEDICAL cooperation
*MUSCLE contraction
*NECK pain
*OCCUPATIONAL diseases
*RESEARCH
*EVALUATION research
*CASE-control method
*SKELETAL muscle
*MUSCLE fatigue
*PHYSIOLOGY
Subjects
Details
- Language :
- English
- ISSN :
- 14396319
- Volume :
- 106
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- European Journal of Applied Physiology
- Publication Type :
- Academic Journal
- Accession number :
- 38609219
- Full Text :
- https://doi.org/10.1007/s00421-009-1019-4