The most common symptoms of PD are tremor, gait
disturbance, stiffness, and slowness. These symptoms together
lead to the alteration of the patient’s gait [2]. Gait parameters
have been used to differentiate PD and healthy subjects. A
stride refers to the distance a subject moves in between two
consecutive times the same heel leaves the floor. Every stride
consists of a stance (heel on floor), and a swing (heel in
motion). The stride actions of left and right heel occur
simultaneously with an overlap [3]. Statistical analysis has
been applied to study gait variability in patients with PD that
uses stride interval parameters to form feature vector in
classification approach [9].
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