- Gait biomechanical parameters: Reflective markers will be positioned on anatomical landmarks of the lower extremities using double-sided sticky tape to allow 3D motion analysis. Wireless surface electromyography units (Trigno EMG, Delsys, Italy) will also be attached to the skin overlying the medial and lateral Gastrocnemius and Tibialis Anterior using double-sided sticky tape to allow the assessment of lower-leg muscle recruitment patterns during the gait cycle. Participants will walk at their usual pace along a figure-of-8 circuit. A force plate (9281EA, Kistler) positioned in the central straight portion of the figure-of-8 will capture kinetic data. The participants will be naïve to the force plate, to help ensure a natural walking gait. Infra-red 3D optical motion analysis cameras (Oqus, Qualisys) will capture kinematic data each time a participant approaches and passes over the force plate. Participants will indicate when they experience the onset of claudication pain and continue until pain prevents them walking further. Outcomes include step length, stride length, cadence, velocity and joint angles, and joint moments and powers of the lower extremities during the three stages of pain development during walking; pain-free walking, after the onset of pain and immediately before stopping walking due to pain.