A LifeCycle GX stationary bike (Life Fitness, Schiller
Park, IL) was used to record foot loads during the motion analysis
studies. Each stock pedal was replaced with a custom pedal box
containing a 6-axis load cell (AMTI, Watertown, MA) [7] to record
kinetic data. An 8-camera Owl motion analysis system (Motion
Analysis Corp., Santa Rosa, CA) recorded kinematic data. Cortex
software (Motion Analysis Corp., Santa Rosa, CA) was used to postprocess
kinematic and kinetic data before usage in OpenSim.