Based on the linked source; automatically prepared and checked against the original report.
Study focus
The research examined whether adjusting a manual wheelchair’s rear axle position changes upper-limb joint kinematics and shoulder-muscle recruitment during propulsion. The authors positioned both rear wheels at the manufacturer’s setting or 3 and 6 centimetres posterior to that position, while keeping seat height constant. The study addressed configuration factors that can alter propulsion forces, joint range of motion and stability.
Participants and protocol
Ten healthy, able-bodied novice men took part; eight were right-arm dominant, and none had previous manual-wheelchair experience or a history of shoulder pathology or instability. Each participant propelled a self-propelled wheelchair along a 10-metre path at a self-selected steady speed. Researchers analysed five consecutive strokes from each of five trials, excluding the initial and stopping pushes after a short familiarisation period.
Measurements and limits
Motion-capture markers recorded trunk and dominant upper-limb movement in three dimensions, using a linked trunk, upper-arm, forearm and hand model. Wireless surface electromyography measured activation in selected dominant-arm shoulder and upper-limb muscles, with signals normalised against same-day maximum voluntary contraction tasks. Because the sample comprised able-bodied novices and the analysis did not distinguish scapular motion, results may not directly represent experienced wheelchair users or people with disabilities.
