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From Fellrnr.com, Running tips
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Our bodies store carbohydrate as glycogen, the critical fuel supply for endurance running. Burning glycogen for energy requires less oxygen than fat, making it more efficient. However, the store of glycogen is limited, and when the supply runs low we "hit the wall". Glycogen is stored primarily in the muscles, but that glycogen can only be used by the muscle it’s stored in and cannot flow through the blood to other places. Some glycogen is stored in the liver where it flows through the blood to all tissues.
* The human liver typically stores between 90 and 160 grams of Glycogen, or 350 to 650 Calories.
* Blood typically contains less than 20 calories of glucose. (This assumes 5 liters of blood and 100mg/dL of blood glucose, which is 5g of glucose.)
* Glycogen can also be created from protein via a process called [http://en.wikipedia.org/wiki/Gluconeogenesis gluconeogenesis], but not from fat.
* Eccentric exercise, such as [[Downhill Running]], can cause [[[[Delayed Onset Muscle Soreness||DOMS]] and impair glycogen replenishment<ref name="O'Reilly-1987"/>.
