Peripheral arterial disease (PAD) affects 8 to 12 million people in the United States. An estimated 5 percent of U.S. adults over age 50 have PAD. Among adults age 65 and older, 12 to 20 percent may have PAD. For the millions of people with peripheral artery disease (PAD), simple activities such as climbing a flight of stairs or a trip to the mailbox can bring on debilitating leg pain. PAD is caused build up of fatty deposits in the arteries of the arms and legs that prevent blood and oxygen from reaching the muscles. This is the same underlying process that is responsible for coronary artery disease, angina, and heart attacks. In fact, PAD raises your risk for heart disease and stroke. Untreated, PAD can lead to chronic pain (claudication), chronic infections and in the most severe cases, amputation of the limbs.
Research has shown that exercise can be highly effective in increasing leg circulation and reducing the pain that accompanies activity (called claudication). Optimum results have been achieved in structured exercise programs based on gradually increasing periods of supervised treadmill walking. However, these programs are rarely offered outside research medical centers and are not covered by insurance so, therefore out of reach for most people with PAD.
In an effort to extend the benefits of structured exercise to more people with PAD, researchers designed a trial to see whether a home-based program using a step activity monitor could approximate the success of supervised center-based programs. One hundred and nineteen volunteers with PAD were randomly assigned to take part in home-based exercise, structured exercise at a medical center, or standard care which included only general advice on lifestyle changes from their doctors at follow up visits.
Individuals in the home exercise group were fitted with a step activity monitor that they wore on their ankles while walking. In addition to being more accurate than the commonly-available belt pedometers, the ankle device captures detailed information on walking speed, incline, and number of steps taken rather than just measuring distance walked. Both exercise groups participated in similar 12-week programs during which they gradually increased their walking time from 20 minutes to 45 minutes per session on three days a week. Individuals in both groups were allowed to set their own walking speed based on the amount of leg pain they felt was tolerable. Instead of treadmill exercise, people in the home group were instructed to walk on level ground in their own neighborhoods. The home group also had seven brief meetings with an exercise physiologist during the course of the study to discuss their progress.
At the conclusion of the 12 weeks, the results of the two exercise groups were surprisingly similar. In both groups, four out of five people stuck with their walking programs. Although the home exercisers generally moved at a slower pace, they chose to extend their walking sessions by an average of 11 minutes past the prescribed exercise time. When it came to reducing PAD symptoms, all the exercisers had far better results than the control group. Individuals in both programs significantly increased the amount of time they could walk without leg pain. There was no change in walking time or symptoms in the group that got standard care without an exercise program.
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