Inclusion Criteria:  Confirmed diagnosis of PD according to the London Brain Bank Criteria; Able to understand the verbal instructions for the tests and to walk; Or attempt to walk independently with no walking aid.  Exclusion Criteria:  Recent surgeries, Deep brain stimulation (DBS); Severe heart diseases, uncontrolled hypertension, myocardial infarction within a period of less than one year; Fitted with a pacemaker; Prostheses in the lower limbs; Stroke or other associated neurological diseases.