The only fuel used in anaerobic glyc is glycogen or blood glucose. AG is the metabolism system used in very high intensity, short duration activities lasting 15-90 seconds (there about) or short duration intermittant activities with work to rest ratios less than 1:3. Generally, rep ranges greater than 8 employ the phopsphagen/creatine system and the AG system.
Fats can only be oxidized using the aerobic metabolic system. When you are recovering from a workout your body is rebuilding phosphagens and glycogen, here you are oxidizing fats for fuel to carry out these tasks.
So realize, your body can only use glycogen or glucose for high intensity, short duration activities.
Now, if you want to get all biochemical and physiological, we can talk about gluconeogensis and ketogensis as amino's, lactate, and fats are broken down by the liver and converted into glucose and other substrates for the body to employ as fuel. But realize if you want the most intense workouts, you need carbohydrates to fuel them.
Br
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