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Originally Posted by pgardn
Never ran out of fuel in such a short race.
Definitely hit a wall training for a marathon.
A good thing before doing the actual thing.
making sure you are under 3 hrs can lead to lots of problems.
Bleeding nipples. I learned about that the hard way
also. Armpits rubbed raw... the usual torture.
Bandaides and vaseline respectively.
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No wall at 5K = probably stayed aerobic. You'll only make lactic acid if you go anaerobic, and start getting your glucose anaerobically (anaerobic glycogenolysis). The milkshake probably didn't help you in the 5K, as you probably didn't get to that point where it could (a sprinter would need it).
Get your carbs, keep your muscle glycogen up
If you tend to cramp, watch your starch component (too high = glycogen overstorage = earlier metabolic fatigue)
Ouch on the usual marathon physical side effects. Severe ouch! Damn!