Effect of System Tilt and Seat-To-Backrest Angles on Load Sustained by Shoulder During Wheelchair PropulsionBy Desroches, Guillaume; Aissaoui, Rachid; Bourbonnais, Daniel; Journal of Rehabilitation Research and Development, Vol. 43, No. 7, pp. 871-881
Publication Date: November 2006
Study conducted to determine the effect of system tilt angle (STA) and seat-to-backrest angle (SBA) changes on the load sustained by the shoulder during manual wheelchair propulsion. A total of 14 older adults with a mean age of 68.2 participated in the study. Combinations of three STAs (0, 5, and 10 degrees) and three SBAs (95, 100, and 105 degrees) were randomly tested. Shoulder load was calculated via joint moments. The analysis did not reveal any significant differences between shoulder joint moments (for the various STA and SBA conditions. The authors contend that changing the seat angle while keeping the wheel-axle position constant maintained the shoulder load at the same level. Therefore, seat angle can be set for maximum user comfort, and for alleviating pressure ulcers without increasing the risk of overuse shoulder injuries.
VA Rehabilitation Research & Development Service (Web Site: http://www.rehab.research.va.gov )