You can’t will yourself to run any faster.” “It’s a big psychological letdown, because you feel powerless.

“You feel like you’re not going anywhere,” says Rapoport. He was experiencing a common phenomenon among marathoners, known as “hitting the wall.” Essentially, the body runs out of fuel, forcing the runner to slow down dramatically. As he entered Manhattan for the last several miles of the race, his legs just didn’t want to keep up the pace. The Harvard-MIT scientist, Benjamin Rapoport, was inspired by his experience in the 2005 New York Marathon. 21 issue of the journal PLoS Computational Biology, which allows runners to calculate personalized targets using an estimate of their aerobic capacity. The result is a new model, described in the Oct. student in the Harvard-MIT Division of Health Sciences and Technology - has taken a more rigorous approach to calculating just how much carbohydrate a runner needs to fuel himself or herself through 26.2 miles, and what pace that runner can reasonably expect to sustain. Now, one dedicated marathoner - an M.D./Ph.D. Most marathon runners know they need to consume carbohydrates before and during a race, but many don’t have a good fueling strategy.

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