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But, he said, the findings offer more clarity on exactly what works. They suggest, for example, that a combination of moderate aerobic exercise and training in strength and balance is most effective for improving stroke patients' mental acuity.
Lauren Oberlin, a graduate student at the University of Pittsburgh, led the study. She said the findings confirm the value of exercise after a stroke.
"It can improve mobility, strength and quality of life, as well as cognition," Oberlin said. And that mental boon, she noted, may give stroke patients "additional motivation" to start an exercise program.
For the study, Oberlin and her colleagues pooled the results of 13 clinical trials that involved a total of 639 patients recovering from a stroke.
The studies all differed in a number of ways -- including the type of exercise they tested, and the duration of the program.
But in general, Oberlin's team found that patients who exercised showed bigger gains in certain mental abilities -- namely, attention and processing speed -- versus those who did not exercise.
And it didn't take a long time, Oberlin said. Even exercise programs lasting four to 12 weeks were effective.
It also appears that exercise helps even when patients begin more than three months after their stroke. In fact, Oberlin said, those patients were, on average, about 2.5 years past their stroke.
But that doesn't have to mean an intense workout, Oberlin noted. Walking on a treadmill does the job. And for people with balance problems or other physical limitations, she said, there are options like recumbent stationary bikes and rowing machines.
Does it necessarily take a formal exercise program? Maybe not, Oberlin said. As long as stroke patients have been cleared to exercise on their own, they may be able to do something as simple as take a daily walk.
"But if you have mobility issues, you might need a supervised program," Oberlin said. "What's critical is that you talk to your doctor first, to make sure that any activity you want to do is safe."
Lackland agreed, and also noted that exercise is just one part of stroke recovery. He said patients need to take "comprehensive measures" to improve their health and reduce the likelihood of suffering another stroke.
Why would physical activity benefit mental sharpness after a stroke?
Other research points to several possible reasons, Oberlin said: Exercise may improve blood flow to the brain, promote the growth of new brain cells and connections among those cells, and reduce inflammation, to name a few.
Oberlin was to present the findings Wednesday at the International Stroke Conference in Houston. Research presented at meetings is considered preliminary until published in a peer-reviewed journal.
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