title: The effect of seat position on wheelchair propulsion biomechanics.
abstract: This study examined the effect of seat position on handrim biomechanics. Thirteen experienced users propelled a wheelchair over a smooth level floor at a self-selected speed. Kinetic and temporal-distance data were collected with the use of an instrumented rim and a motion analysis system. A custom-designed axle was used to change the seat position. We used repeated measures analysis of variance to evaluate if differences existed in the temporal-distance and kinetic data with change in seat position. Results showed that a shorter distance between the axle and shoulder (low seat height) improved the push time and push angle temporal variables (p < 0.0001). Tangential force output did not change with seat position. Axial and radial forces were highest in the lowest seat position (p < 0.001). Propulsion efficiency as measured by the fraction of effective force did not significantly change with seat position.
authors.affiliation: Orthopedic Biomechanics Laboratory, Mayo Clinic, Rochester, MN; Motion Analysis Laboratory, Mayo Clinic,Rochester, MN 55905, USA. kotajarvi.brian@mayo.edu
authors.forename: Brian R
authors.initials: BR
authors.lastname: Kotajarvi
authors.forename: Michelle B
authors.initials: MB
authors.lastname: Sabick
authors.forename: Kai-Nan
authors.initials: KN
authors.lastname: An
authors.forename: Kristin D
authors.initials: KD
authors.lastname: Zhao
authors.forename: Kenton R
authors.initials: KR
authors.lastname: Kaufman
authors.forename: Jeffrey R
authors.initials: JR
authors.lastname: Basford
mesh_terms: D000328:Adult; D001132:Arm / Q000503:physiopathology*; D001696:Biomechanical Phenomena; D004526:Efficiency / Q000502:physiology*; D004867:Equipment Design; D005260:Female; D006225:Hand / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009068:Movement / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology; D011187:Posture / Q000502:physiology*; D013119:Spinal Cord Injuries / Q000503:physiopathology / Q000534:rehabilitation; D014910:Wheelchairs