Then does that mean that your body goes to the glucose stores first, and
then the protein stores?

From what I am reading, the three phases of ATP production when working out
is Phosphagen (less than 10-15 seconds), then Glycogen-Lactic (up to 10
minutes), and finally Aerobic Respiration (long duration workout) system.

Now, if you have "correct" levels of carbs, you will burn 5% protein during
a high intensity workout, low carb though is up to 10% protein used when
working out?
Does this protein consumption happen gradually, or does it happen after the
phosphagen and Glycogen-Lactic production of ATP.
What I am wondering is if I should consider "carbing up" (NOT carbo loading)
the night before I go to the gym by eating something like a whole wheat
bread or something with more carbs, do avoid using protein for energy.

Does anyone find that if you are going to partake in vigorous exercise, it
is a good idea (if you are on maintenance levels of a general low carb diet)
to eat a bit more carbs before hitting the gym, etc?

I find that when I partake in exercise, I can feel very drained afterwards.
Roger Zoul said that this might happen for me, because I am eating lower
carbs... However I do not want to negatively impact my body, or my workouts.

If you were to burn more protein working out on a LC diet, then what is the
best (and hopefully inexpensive) way to replace the extra protein burned?

Thanks for any insight.