nyt reports on a cyclist with parkinson's disease

Pretty amazing: a Dutch man afflicted with Parkinson's disease is unable to walk, but somehow able to ride a bicycle.  From the article:

the man told Dr. Bloem something amazing: he said he was a regular exerciser — a cyclist, in fact — something that should not be possible for patients at his stage of the disease, Dr. Bloem thought.

“He said, ‘Just yesterday I rode my bicycle for 10 kilometers’ — six miles,” Dr. Bloem said. “He said he rides his bicycle for miles and miles every day.”

“I said, ‘This cannot be,’ ” Dr. Bloem, a professor of neurology and medical director of the hospital’s Parkinson’s Center, recalled in a telephone interview. “This man has end-stage Parkinson’s disease. He is unable to walk.”

But the man was eager to demonstrate, so Dr. Bloem took him outside where a nurse’s bike was parked.

“We helped him mount the bike, gave him a little push, and he was gone,” Dr. Bloem said. He rode, even making a U-turn, and was in perfect control, all his Parkinson’s symptoms gone.

Yet the moment the man got off the bike, his symptoms returned. He froze immediately, unable to take a step.

The Times posted a video along with the article.