Abstract
This study investigated the effects of a dynamic chair backrest on body movements while typing on a computer. Eighteen subjects typed continuously with either the chair backrest locked (30 minutes) or unlocked (30 minutes). Treatment order was counterbalanced. Results showed no significant differences between chair back conditions in either the total number of movements or specific body movements over the duration of the test. Even though body movements occurred, typing is a task that inherently requires a relatively static posture, and sitting in a chair with a dynamic back may not necessarily encourage greater movement while typing. However, use of a free moving dynamic chair back did provide better back support for subjects when they changed from upright to reclined postures.
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