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Article PreviewThis is a preview of the full article. New Scientist Full Access is available free to magazine subscribers. To continue reading log in now, on the right. Pump iron to lose the pounds
If you want to lose weight but can't stand running, lift weights instead. New research in mice shows that strength training is just as good as endurance training at burning off fat. Running and other endurance activities build up what's known as "slow" or type I muscle. It is rich in mitochondria, the energy powerhouses of cells, and research has shown that this type of muscle combats weight gain and reduces the incidence of metabolic problems. "Fast" or type II muscle - the kind you build when pumping iron - is mitochondria-poor and was thought to be less effective in reversing weight gain. Kenneth Walsh at Boston University School of Medicine and his colleagues were curious to know how weight training affects metabolism. So they designed a mouse in which Akt1, a gene involved in building type II muscle, could be switched on and off by giving the mice a ... The complete article is 324 words long.
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