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Phosphagen Energy System
During short-term, intense activities, a large amount of power needs to be produced by the muscles, creating a high demand for ATP. The phosphagen system (also called the CrP-ATP system) is the quickest way to resynthesize ATP. Creatine phosphate (CrP), which is stored in skeletal muscles, donates a phosphate to ADP to produce ATP. During rest the ATP will help to restore CrP.