Tuesday, November 10, 2009

Calories Out

Runner’s World has an intriguing Peak Performance blog entry up which discusses the amount of calories burned by various exercises like running, biking, walking and swimming. I was always under the impression that whether you ran or walked a mile, the energy expenditure was the same-roughly 100 calories. Apparently that isn’t the case. Running actually burns about 30 percent more calories per mile than walking, because running involves a completely different form of locomotion than walking. Runners "hop" or "bounce" across the ground, while walkers skim along without raising their center of gravity. All that hopping burns a lot of extra calories. There is a handy chart in the article that compares the exercises. For simplicity sake, in running, your gross calorie burn per mile = .75 x wt in lbs. For walking, it = .57 x wt in lbs. So a 175 pound runner burns approximately 130 calories per mile. Hand me another granola bar.

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