Motors and Dampers: The Energetic Tradeoffs in the Shod Foot With Increasing Walking Velocity

At all velocities, the MTP joint functioned as a mechanical damper and its damping characteristics became more pronounced as velocity increased. The midtarsal joint functioned as a strut, with a small motor role which became more prominent as velocity increased. The ankle had mixed roles, primarily between strut and spring, with a small damper/motor role that traded off with velocity (less damper more motor as velocity increased). The presence of supportive footwear attenuated positive and negative work across velocities when compared to previous barefoot studies, with the largest difference in the midtarsal's negative work, suggesting footwear substantially modifies natural foot mechanics through increasing velocities.