Carbohydrates stored in the muscle and liver are important for both anaerobic and endurance performance. The form of carbohydrate stored in the tissue is glycogen, a polysaccharide of glucose stored with phosphates and water in a 1:3 ratio. Muscle glycogen provides the necessary fuel for energy metabolism in striated muscles, while liver glycogen supplies glucose to other cells and maintains blood glucose levels for brain function. During exercise, muscle tissues begin to use glycogen while the liver releases glycogen into the blood at a proportional rate to thwart hypoglycemia. Fatigue during endurance events or prolonged anaerobic activity has been associated with low glucose levels in the
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