The mass of energy-rich phosphates are stored in the muscle: Adenosine triphosphate (ATP), creatine phosphate (KrP) and other phosphate stores (phosphages). These are the basis of energy supply. Muscle contraction occurs due to the decay of the energy-rich phosphates. The energy supply is aimed exclusively at rebuilding these phosphates to ensure continued muscle contractions.

Energy sources are muscle glycogen in addition to phosphates. Glycogen and fats are also found in other depots (liver and subcutaneous fat).

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