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The effect of over-commitment and reward on trapezius muscle activity and shoulder, head, neck, and torso postures during computer use in the field.

Authors
Bruno Garza-JL; Eijckelhof-BHW; Huysmans-MA; Catalano-PJ; Katz-JN; Johnson-PW; van Dieen-JH; van der Beek-AJ; Dennerlein-JT
Source
Am J Ind Med 2013 Oct; 56(10):1190-1200
NIOSHTIC No.
20043138
Abstract
Background: Because of reported associations of psychosocial factors and computer related musculoskeletal symptoms, we investigated the effects of a workplace psychosocial factor, reward, in the presence of over-commitment, on trapezius muscle activity and shoulder, head, neck, and torso postures during computer use. Methods: We measured 120 office workers across four groups (lowest/highest reward/over-commitment), performing their own computer work at their own workstations over a 2 hour period. Results: Median trapezius muscle activity (P = 0.04) and median neck flexion (P = 0.03) were largest for participants reporting simultaneously low reward and high over-commitment. No differences were observed for other muscle activities or postures. Conclusions: These data suggest that the interaction of reward and over-commitment can affect upper extremity muscle activity and postures during computer use in the real work environment. This finding aligns with the hypothesized biomechanical pathway connecting workplace psychosocial factors and musculoskeletal symptoms of the neck and shoulder.
Keywords
Musculoskeletal-system-disorders; Ergonomics; Computer-equipment; Computers; Extremities; Body-mechanics; Body-regions; Exposure-assessment; Job-analysis; Task-performance; Anthropometry; Muscle-function; Muscle-stress; Posture; Keyboard-operators; Physiological-measurements; Epidemiology; Repetitive-work; Biomechanics; Psychological-factors; Sociological-factors; Office-workers; Video-display-terminals; Author Keywords: Psychosocial; VDT; MSDs; exposure assessment; office ergonomics
Contact
Jack T. Dennerlein, Northeastern University, 6 Robinson Hall, Office 308F, 360 Huntington Avenue, Boston, MA 02115
CODEN
AJIMD8
Publication Date
20131001
Document Type
Journal Article
Email Address
j.dennerlein@neu.edu
Funding Type
Grant
Fiscal Year
2014
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-008781; M102013
Issue of Publication
10
ISSN
0271-3586
Source Name
American Journal of Industrial Medicine
State
MA; WA
Performing Organization
Harvard University, School of Public Health, Boston, Massachusetts
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