What is the clinical application of the concept behind creatine phosphate?

Creatine phosphate is a biological organic molecule that can be found in skeletal muscle and brain tissues.  It is somewhat of an amalgamation of two different amino acids (argenine and glycine) with a phosphate group attached as well.  The molecule is synthesized in the liver where the bloodstream transports it to other parts of the body.  Creatine phosphate can serve as a fast source of a phosphate group to quickly convert ADP to ATP under low oxygen conditions for extra energy during high exertion type situations.  Conversely, during periods of rest ATP can convert to ADP and phosphorylate a creatine molecule to produce a supply of creatine phosphate.  The reversibility of the phosphorylation of creatine makes creatine phosphate a convenient source of quick energy in tissues like muscle and brain that have highly fluctuating energy demands.