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It really depends on the metabolism of the runner, the physical characterists of the runner: weight, age, sex, general physical condition, and other factors. A major factor is the training schedule. A miminum 2500 calories daily is a subsistance level for a longdistance runner who does not expect to lose weight. Bell State University in Ohio, in the early 80s, was a major source of running physiology data. Dr. David L. Costill and the Human Performance Laboratory did 25 years of extensive work with runners, world class and others; his body of work at the HPL is still the basis for much that we know about running not based on uninformed coaches' notions and hunches. In short, there is no single number which fits all distance runners.

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17y ago

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