You should always take into consideration that the body has lots of glycogen reserves in your liver, around 70 - 100 grams, which would provide you with around 350 - 400 calories coming from the stored glucose should your body really need it. (fitnessandpower.com)
A muscle cell with a lot of glycogen makes more energy available for growth processes. (fitnessandpower.com)
Doing explosive exercise for hours on end requires a lot of glycogen. (gymjunkies.com)