Factors Associated with Falling in Parkinson's Disease

Parkinson's Disease group Inclusion criteria: * Persons with idiopathic PD diagnosed by a medical doctor according to the United Kingdom PD Brain Bank Criteria * Aged between 18 and 75 years-old * Stage 3 on the Hoehn and Yahr scale in the on-medication state * On a stable dose of PD medication (at least one week) * Able to stand and walk on a treadmill without support for at least 3 minutes * Able to give consent Exclusion criteria: * Atypical parkinsonism * Unpredictable symptom fluctuations * Previous surgical management of PD (i.e., deep brain stimulation surgery; pallidotomy) * Duodopa pump therapy * Dementia (Montreal Cognitive Assessment (MoCA) \< 21)\[1\] * Symptomatic orthostatic hypotension (e.g. frequent syncope episodes) * Concurrent neurological disorders (e.g. stroke) * Comorbidities that affect gait or balance (e.g. peripheral neuropathy) * Acute illness * Epilepsy or history of seizures * Depression (MDS-UPDRS item 1.3 ≥ 2) * Body weight over 120 kilograms * Pregnancy * Participation in other ongoing experimental trials Healthy control group Inclusion criteria: * Age and sex-matched healthy adults Exclusion criteria: * Symptomatic orthostatic hypotension (e.g. frequent syncope episodes) * Body weight over 120 kilograms * Pregnancy * Participation in other ongoing experimental trials