Figure 1.
Experimental set up for target presentation during walking. Subjects matched velocity (V) and step frequency (SF) targets simultaneously while walking along a 7-m walkway. Velocity 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.