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Doesn't running or sprinting on whatever increase mitochondrial density which then spares muscle glycogen and uses more lipids instead? So maybe that somehow contributes to the overall calorie burn?
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Sprinting doesn't increase mitochondrial density, if anything it decreases the amount of mitochondria. Sprinting uses Type II muscle fibers, which are characterized by low mitochrondrial density. It will increase those Type II muscle fibers, thus decreasing the proportionate amount of mitochondria.
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