Using a Wheelchair Seating System to Measure Postural Effects on User Comfort and Typing Performance

Abstract

Many people who experience chronic low back pain find that sitting upright for long periods of time can cause discomfort. For some, a measure of relief is achieved by lying down periodically throughout the work day. Devices exist that allow computer operators to work from a significantly reclined or supine posture. However, very little has been written to describe the impact of these alternate postures on typing performance and user comfort. The ability to move from an upright to a supine posture is also important for the health of many wheelchair users. Tilt and recline wheelchair seating systems are frequently used to address this need. This study used a modified tilt and recline wheelchair seating system to measure the impact of five different postures on typing performance and user comfort. Preliminary analyses indicate discomfort in upper extremities may cause significant differences in typing speed and user comfort in supine positions.