lieved that 95 - 98% of the creatine in our body is stored in our muscles. The remaining 2 - 5% is stored in various other parts of the body including the brain, heart !
and testes (Does Creatine Work, 2000).
This creatine is used for several things within the human body, though scientists are still uncertain of all of its uses within the body. Much of what creatine does is in the body is still just a theory, with some debate over the role creatine actually plays in bodily processes. Current research does seem to indicate that creatine serves four purposes within the body.
First and foremost, creatine provides additional energy for a person's muscles. The human body gets energy from many sources, but when it needs quick bursts of energy, its primary source is ATP (adenosine tri-phosphate). When muscles use ATP for energy a chemical process happens where the ATP is broken down into two simpler chemicals ADP (adenosine di-phosphate) and inorganic phosphate. This process of ATP turning into ADP releases the energy which gives muscles the ability to contract. The body does not have an endless supply of ATP, however, so it can run out. This is where the creatine comes in. The majority of creatine that is stored in the muscles bonds with phosphorus stores also located in the muscles, and is converted into Creatine Phosphate (CP) (Houston, 2000). CP is able to react with the ADP found in the body and turns the useless ADP back into a useful energy source - ATP. The more ATP in the body, the longer a person's muscles can exercise.
The second function creatine serves is the Volumization of muscles, that is the process of pulling fluid into the muscle cells and thus increasing the volume of the muscles. Creatine has been shown to pull water into muscle cells, which increases the size of the muscles. At this point it is not clear how great an affect this volumization has, the first point is still a much greater ben...