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by zimpenfish 3805 days ago
You can, perhaps, train yourself to burn fat more efficiently which helps.

e.g. http://home.trainingpeaks.com/blog/article/using-low-carbohy...
1 comments
IgorPartola 3805 days ago
Cool. Though your linked article still states that peak fat burn output is still lower than peak carb burn output and that high intensity still is best served by carb rich diet.
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DrScump 3805 days ago
"high intensity" is sprinting, not distance running.
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brianwawok 3804 days ago
Well you are burning quite a few more carbs than fat even at a fast 1/2 or full marathon. Not sure exact switchover from more carbs to more fat is, maybe 5 or 6 hours?
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DrScump 3804 days ago
"Well you are burning quite a few more carbs than fat even at a fast 1/2 or full marathon"

No, you aren't. Your liver can hold only so much glycogen, and you'll use that up well before the 10-mile mark.

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zimpenfish 3803 days ago
http://www.ncbi.nlm.nih.gov/books/NBK22417/ suggests that an elite athlete (they're talking about 2 hour marathons) could fuel about 1:20 of that with glycogen (~18 miles) but that they burn about equal glycogen/fat (which would give 13 miles of glycogen.)

I suspect your 10 mile mark is probably correct for anyone below "almost-elite".

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