Fig. 1From: A novel push–pull central-lever mechanism reduces peak forces and energy-cost compared to hand-rim wheelchair propulsion during a controlled lab-based experimentA The prototype of the push–pull single lever propulsion mechanism tested in the current study (RoChair; ROTA Mobility, California). B Close-up of the lever with the integrated unilateral force sensor at the right side. C The Küschall HRW with Smartwheel in the right rear wheel, which functioned as a controlBack to article page