Fig. 1.

Illustrations of step length and marker positions for split-belt walking (A) and the marching-walking hybrid (B). Step length is defined as the anterior-posterior distance between the ankle markers at heel strike. Fast (walk) step length occurs at heel strike on the fast (walk) belt, and slow (march) step length occurs at heel strike on the slow (march) belt. Infrared emitting markers were placed bilaterally on the fifth metatarsal head (MT), lateral malleolus (LM), lateral femoral epicondyle (LE), greater trochanter (GT), iliac crest (IC), and acromion process (AP).