Exercise and Transcranial Magnetic Stimulation: Increasing Brain Plasticity in Parkinson's Disease

Inclusion Criteria: * Diagnosis of PD according to the UK Brain Bank Criteria, confirmed by a neurologist with expertise in movement disorders; * Hoehn and Yahr stage II to III; * On a stable medication regimen since at least 2 weeks prior the enrolment in the study and, in the view of the treating neurologist, unlikely to require medication adjustments in the following 3-6 months. Inclusion Criteria (Healthy Controls) * Male or Female; aged 35-85 Exclusion Criteria (Healthy Controls) * History of seizure disorder, including febrile seizures; * Neurological disorder including PD, stroke, traumatic brain injury, fainting spells or syncope of unknown cause(s); * Major or unstable medical illness; * Pacemakers, neurostimulators, tattoos or metal foreign bodies in the head area (dental fillings are allowed); * Untreated depression, or score of \>20 on Beck Depression Inventory II; * Taking any of the following medications within the six weeks prior to the start of the study: imipramine, amitriptyline, doxepin, nortriptyline, maprotiline, chlorpromazine, clozapine, foscarnet, ganciclovir, ritonavir, theophylline, calcium channel blockers, beta blockers, tadalafil, vardenafil, avanafil, and sildenafil; * Diagnosis of dementia, or Montreal Cognitive Assessment (MoCA) \<20; * Any clinically significant abnormality on vital signs * Cardiopulmonary limitations: untreated high blood pressure, history of heart insufficiency (class II-III), coronary vascular disease, angina, arrhythmia, dyspnea on exertion and asthma