Man with Parkinson Disease rides a bike

A 58-year-old man with a 10-year history of idiopathic Parkinson's disease presented with an incapacitating freezing of gait. However, the patient's ability to ride a bicycle was remarkably preserved. (In Video 2, the patient is not wearing a safety helmet because in the Netherlands, wearing a safety helmet is neither required by law nor customary.) http://bit.ly/c4BQ2f