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SSMI EXERCISE PHYSIOLOGY TIP: Fun facts about carbs!
Skeletal muscle in humans contain, on average, 15 to 18 grams of glucose per kilogram of wet weight stored as glycogen. For the standard 70 kg man, this is approximately 400 gr of muscle glycogen. Note that this represents an estimate of the total skeletal muscle carbohydrate pool, whereas a contracting muscle can draw only on its own glycogen reserves and not on the pools in noncontracting muscles.
Normally, there are 5-6 grams of glucose available in the blood. Although muscle uptake of blood glucose increases during exercise, the blood concentration does not fall, due to an increased rate of glucose release from the liver, except during prolonged work. The liver represents a highly labile glycogen reserve of some 50 to 90 grams.