We observed that trained participants generally made changes to their working posture, from either a sitting to a standing posture or vice versa, when they completed a particular work task (e.g.,reading the fax, entering data, printing and proofing the output).
The shifting to a different task provided the opportunity for the participant to make postural variations and to take a break in their sustained working posture. The benefits of postural variation is also supported by Graf et al. (1995) where work tasks with less frequent and postural change were associated with a higher incidence of
MSDs.