The Impact of Exercise on Subthalamic Nucleus Neural Activity in Parkinson's Disease

Participants will complete a forced exercise (FE) and voluntary exercise (VE) session. Forced exercise is a mode of high intensity exercise in which voluntary exercise rate is augmented, but not replaced. Voluntary exercise is standard stationary cycling. FE and VE exercise sessions will be Off antiparkinsonian medication. The order in which exercise session is conducted first will be randomized. Bilateral neural activity of the STN will be continuously recorded for 130 minutes (pre, during FE or VE and post-exercise).