Creatine phosphate is stored within muscle tissue and is a source of stored energy used during short bouts of high-intensity exercise. The creatine phosphate stored in your muscle tissue assists your body’s main energy source used during the first few seconds of performing any type of exercise, called adenosine triphosphate, or ATP. Your body uses ATP for energy during the first five seconds of any exercise, such as lifting a weight, and stored creatine phosphate is then oxidized to produce an additional five to eight seconds of energy. This entire process lasts for about 15 seconds. Creatine supplements help increase the amount of creatine phosphate stored in your muscle tissue allowing you to lift more weight for more reps.
This may explain why the fat-burning effects of eating more protein were confirmed in a study published in the American Journal of Physiology. One group was fed a high-protein diet (just over 1 gram per pound of body weight per day) while the second group consumed an amount closer to the lower recommendation of the RDA (recommended dietary allowance). The group eating the higher-protein diet burned the most fat.