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Originally Posted by NBS 4life  Fat oxidation and carbo uitilisation is largely dependent on intensity and training type. For you someone who does alot of long duration training your fat oxidation capacity will be far better than someone like me who trains for power and strength.
This can be illustrated by a v02 max test when someone is hooked up to a metalyser. It can be clearly seen that those who train long distance can go for further in the test using fat as their primary energy source. Those who are prodominantly anaerobically trained may get to a similar point in the test but their vo2 max is lower and they rely on their power to get them through the test. They burn carbs far earlier on in the test and their respitory quotient is much higher than endurance athletes.
This can also come down to fibre type as well.
Sure beats playing "what did I eat".... 
So in answer to your question I personally believe you will have oxidised fat as your energy source for quite a long period of time. Also if you ran that far then you must have been working at a resonably low % of your vo2max which would lead someone to the idea that your respitory quotient was reasonably low. |
OUTSTANDING RESPONSE!!!!!!!!!!!!!
If I can take a crack at adding a bit more....
FF is in amazing shape....his glycogen storage capacity and his bodies ability to generate energy (via lots of adapted mitochondria) have developed over time to a tremendous level....but just the same, the body doesn't burn only from what you eat just before you exercise, nor does it burn solely what's been stored from previous meals; it burns a combination.
From both carbs & fats, the body will convert these foods into energy. Carbs are converted very efficiently and quickly, whereas fats are more complex and require more time & energy to breakdown....but still, both are a source of energy.
FF ate a whole bunch of fats and some stimulant. I'm sure his body went to work right away converting the fats into usuable energy to fuel his run. Based on his ability to run 27 milles non-stop, I'm sure his 8-mile trek just barely got him into his stride.
I dunno....if I had to guess, I'd figure if FF ate pure carbs he would have fueled 50% of his run with that energy and he's have explosive power. Since he ate fats, he probably fueled 37% of his run with the flax/fish only because it takes a bit longer to convert fats...so he burned a bit more of his (massive) storage energy.
I dunno, the "crack" theory sounds pretty solid too....
This is better then playing the "What did I eat game"!!!!
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