It’s probably not news to you that Americans just don’t exercise enough. Less than half of us meet the recommended amount of weekly physical activity—despite research that shows exercise can be just as effective as drugs in some cases to treat diseases such as diabetes. So why don’t we prescribe exercise in specific doses, like we would a drug?
In order to do that, you need to know exactly how much activity produces how much benefit, and whether there’s an upper limit, at which point the helpful effects either start waning or begin to do more harm than good. That’s what Paul Williams, a staff scientist at Lawrence Berkeley national Laboratory, and his colleagues wanted to know—and they found out in a new report published in Mayo Clinic Proceedings.
Williams started with a group of heart-attack survivors who had…
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