title: The effect of overcommitment and reward on muscle activity, posture, and forces in the arm-wrist-hand region--a field study among computer workers.
abstract: OBJECTIVE
  Office workers with high levels of overcommitment and low levels of reward are thought to be more prone to arm-wrist-hand symptoms, possibly through a higher internal physical exposure. The aim of this study was to examine the effects of high overcommitment and low reward on (i) forearm muscle activity, (ii) wrist posture and kinematics, and (iii) forces applied to computer input devices during computer work in an actual work setting.
  
  
  METHODS
  We continuously measured wrist extensor muscle activity, wrist posture and kinematics, and forces applied to the keyboard and mouse for two hours during the daily work of 120 office workers with four different levels of overcommitment and reward (low-high, high-high, low-low, and high-low).
  
  
  RESULTS
  Wrist velocities and accelerations in radial-ulnar direction were higher for workers with high compared to low overcommitment, while their wrist range of motion was similar, possibly indicating a higher work pace. Wrist extensor muscle activity and forces applied to the keyboard and mouse were not increased by high overcommitment and/or low reward.
  
  
  CONCLUSIONS
  Overall, our findings provide little support for the proposed pathway of high overcommitment and low reward in the development of arm-wrist-hand symptoms through a higher internal physical exposure.
authors: Department of Public and Occupational Health and the EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, The Netherlands.
authors: Belinda H W
authors: BH
authors: Eijckelhof
authors: Jennifer L
authors: JL
authors: Bruno Garza
authors: Maaike A
authors: MA
authors: Huysmans
authors: Brigitte M
authors: BM
authors: Blatter
authors: Peter W
authors: PW
authors: Johnson
authors: Jaap H
authors: JH
authors: van Dieën
authors: Allard J
authors: AJ
authors: van der Beek
authors: Jack T
authors: JT
authors: Dennerlein
mesh_terms: D001132:Arm / Q000502:physiology*; D003201:Computers; D006801:Humans; D018482:Muscle, Skeletal / Q000502:physiology*; D016273:Occupational Exposure; D011187:Posture