Monday, October 6, 2008

Exercise in a Pill?



For every couch potato out there, LISTEN UP! What if a drug could help you gain some of the benefits of exercise without working up a sweat? Scientists reported Thursday that there is such a drug, there's just a small catch, you have to be a mouse.

Sedentary mice that took the drug for four weeks burned more calories and had less fat than untreated mice. And when tested on a treadmill, they could run about 44 percent farther and 23 percent longer than untreated mice. Just how well those results might translate to people is an open question. But someday, researchers say, such a drug might help treat obesity, diabetes and people with medical conditions that keep them from exercising.

"We have exercise in a pill," said Ron Evans, an author of the study. "With no exercise, you can take a drug and chemically mimic it." Evans, of the Salk Institute for Biological Studies in La Jolla, Calif., and the Howard Hughes Medical Institute reports the work with colleagues in a paper published online Thursday by the journal Cell. They also report that in mice that did exercise training, a second drug made their workout much more effective at boosting endurance. After a month of taking that drug and exercising, mice could run 68 percent longer and 70 percent farther than other mice that exercised but didn't get the drug.

But Eric Hoffman of the Children's National Medical Center in Washington, D.C., noted that AICAR mimics only aerobic exercise, not the strength training that might be more useful to bedridden people or the elderly, for example. He also cautioned that it's not clear whether the new mouse results can be reproduced in people. Goodyear said exercise has such widespread benefits in the body that she doubts any one pill will ever be able to supply all of them. "For the majority of people," she said, "it would be better to do exercise than to take a pill."

Original Article

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