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Experimental set up for target presentation during walking. Subjects matched gait speed (V) and step frequency (SF) targets simultaneously while walking along a 7 m walkway. Gait speed target was provided by flags attached to a rope loop running parallel to the length of the walkway and being driven at a constant velocity by a motor. Step frequency was provided by an audible metronome. Step length (SL) was also constrained because V = SL*SF.
