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Context : Motorized treadmills (MTs) present an altered motor task compared to overground (OG) locomotion in that MT belt surfaces are motor-driven, whereas individuals walking/running OG must propel themselves. A possible solution may lie with novel nonmotorized treadmill (NMT) devices as the belt surface is propelled by the user. Objective : The purpose of this study was to compare gait performance during both MT and NMT locomotion to OG. Design : Crossover study. Setting : A university research laboratory. Patients : A total of 20 healthy adults (10 women) participated in the study. Intervention : Each participant performed self-selected walking and running OG, and on both an MT and …