26 Nov '14, 5am

Boost your fuel efficiency by training on an empty tank.

Carbohydrates are your body's most readily available fuel source, but only a limited amount can be stored—enough to last for about 90 minutes of intense exercise—mostly in the muscles and liver. Researchers have found that training in a carb-depleted state helps the muscles adapt to burning more fat and boosts your body's capacity for stored carbohydrate by as much as 50 percent. Whether all this translates to faster race times is unclear, but for Coolsaet and Gillis, the evidence was compelling enough to give it a try. After working with physiologist Trent Stellingwerff, Ph.D., of the Canadian Sport Centre-Pacific, they ran personal bests of 2:10:55 and 2:11:27 in Toronto, and qualified for the Olympic Marathon in London. Here's how to experiment with running on empty.

Full article: http://www.runnersworld.com/running-tips/running-e?adbid=...

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