AICAR

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In 2008 researchers at the Salk Institute discovered that AICAR given

to experimental mice significantly improves their performance in

endurance-type exercise, apparently by converting fast-twitch muscle

fibers to the more energy-efficient, fat-burning, slow-twitch type.[2]

It stimulates glucose uptake and increases the activity of p38 mitogen-

activated protein kinases á and â in skeletal muscle tissue,[3] as well

as suppressing apoptosis by reducing production of reactive oxygen

compounds inside the cell.[4]

http://en.wikipedia.org/wiki/AICAR more links there.