Originally Posted by
elcruxio
Like I mentioned before, glycemic index doesn't matter when exercising. You could drink straight up glucose syrup and it would not matter.
I don't understand what your second point is referring to. If you eat too much on a too short a ride that's bad? I'd say that's obvious. Are you perhaps trying exaggerate a bit? A 500 kj ride is something like three kilometers riding fairly slowly.
On the other hand above two hours starts to be a time period where additional carbs may start becoming beneficial depending on exertion levels. It's certainly possible to blow through all the stored glycogen in two hours.
Maltodextrin has a higher glycemic index than glucose syrup.
And yeah, it certainly can matter.
The 4k world record was completed using approximately 150 kJ. Try again. Or don't, since your response perfectly illustrates how little most people know about their calorie expenditure during exercise. You made my point precisely.