 Spatial and Temporal Gait Variables will be measured during treadmill walking at a fixed speed of 0.9 meter per second. A treadmill instrumented with a Force Sensory ArrayFSA pressure mat Vista Medical, Ca will be used for this purpose . Each participant will walk for two minutes and the following variables average and coefficient of variation of 60 consecutive steps; will be determined: stance duration, swing time, step time, step length and step width. 