Low-intensity exercise appears good for Parkinson's patients, study says

University of Maryland study could lead to new advice

  • Thomas Manning who has had Parkinson's for 10 years, exercises daily on the treadmill in his Scaggsville home.
Thomas Manning who has had Parkinson's for 10 years, exercises… (Amy Davis, Baltimore Sun )
April 15, 2011|By Meredith Cohn, The Baltimore Sun

Although doctors often advise Parkinson's disease patients to exercise — and the more intense the exercise, the better — new research from the University of Maryland Medical Center shows that long walks at a more comfortable pace may be the best medicine.

Dr. Lisa M. Shulman, co-director of the University of Maryland Parkinson's Disease and Movement Disorders Center, made the surprise discovery recently that low-intensity workouts make the most difference in mobility and gait, which become a problem for most of those who sufferer from the disease. The information could lead to new advice from doctors and give hope to patients who can't manage a tough workout.

"Difficulty walking is the greatest cause of disability in people with Parkinson's disease," said Shulman, also a professor of neurology. "These results have important implications for how we manage Parkinson's disease, since low-intensity exercise can be done by most people with Parkinson's, and our patients frequently ask what type of exercise they should be doing."

Parkinson's is a degenerative neurological disorder that affects an estimated one in 100 people, usually seniors but not always, according to the Michael J. Fox Foundation, which helped sponsor Shulman's research. An estimated 1 million Americans are living with the disease.

For her study presented to the American Academy of Neurology this week, Shulman brought 67 Parkinson's patients ages 40 to 80 to the Baltimore VA Medical Center three times a week for three months. She randomly assigned them to one of three groups. The first walked for 50 minutes at their normal pace on a treadmill. Another did faster, shorter workouts on a treadmill. A third group did stretching and resistance exercises.

She documented how fast and far the patients could walk, and the low-intensity group made the most progress. She also found that overall Parkinson's symptoms such as tremors improved in those who did the stretching.

"At the end of the day, how well you can perform daily activities is what's really most important," she said, adding that she'll now recommend a combination of walking and stretching several times a week.

Thomas Manning, a retired Scaggsville home inspector and study participant, was so impressed by his results in the treadmill study that he bought a machine for his house after the study ended. He now walks daily for the physical benefits and for the boost in confidence he gets every time he finishes.

Manning, 78, said he can't stand using a cane and wants to stay as mobile as possible for as long as possible. That means he's less of a burden on his family and can continue his part-time job in the stockroom at a Napa auto parts store — which he says also provides more physical and mental exercise.

"Exercise is the name of the game," he said. "I'm a convert."

Other researchers have studied exercise for Parkinson's patients and seen benefits, though they aren't entirely sure how it works. They say that, in general, Parkinson's disease isn't completely understood. It's frequently misdiagnosed because there is not a test to confirm its presence.

Doctors believe Parkinson's results from the loss of cells in the brain that produce dopamine, a chemical that delivers signals within the brain that coordinate movement. As patients lose dopamine, they lose control.

The disease, thought to be caused by genetic and environmental factors, can progress at different rates in people, and symptoms can vary. Manning, for example, said his Parkinson's developed about a decade ago after he was bitten by a tick and came down with Lyme disease. His physical symptoms are not readily noticeable, except for a slight tremor sometimes in his right hand.

Tremors are a telltale sign of the disease. The Fox foundation says other symptoms are slowness of movement, balance problems, rigidity and reduced facial expression. They can also include cognitive impairment, mood disorders, sleeplessness, loss of ability to smell, drooling and low blood pressure.

The Fox foundation and other Parkinson's groups already advise sufferers to exercise, though some, like the National Parkinson Foundation, point to research supporting more intense exercise. Todd Sherer, Fox's chief program officer, said it's probably too early to recommend only low-intensity exercise and stretching, but based on the new research and other studies, doctors should be talking about exercise with all their Parkinson's patients.

Sherer said the foundation will continue to fund exercise research and hopes in coming years to make specific recommendations to the public and to doctors.

"This was a small study, but there was some real evidence in a controlled environment that exercise can be beneficial," he said. "Other studies have shown that exercise can be beneficial. What's important for the patient is to find exercise that they enjoy and is comfortable, because they have to keep doing it."

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