![]() Researchers theorize that the shorter rest time between laps was not enough for the swimmers' bodies to resynthesize phosphocreatine. However, their speed did not improve when swimming 10 sets of 25-yard lengths started at 1-minute intervals. Men taking the supplement had significant increases in speed when doing six bouts of 50-meter swims started at 3-minute intervals, compared to men taking placebo. Placebo-controlled study investigated creatine and swimming performance in 18 men and 14 women. Studies have found that creatine can improve performance in exercises that involve repeated short bursts of high-intensity activity with intervening rest periods of adequate length. However, the balance of current evidence suggests that that if creatine supplements have any benefit for sports performance, it is slight and limited to highly specific forms of exercise. Supplemental creatine may also help the body make new phosphocreatine faster when it has been used up by intense activity. In theory, taking supplemental creatine will build up a reserve of phosphocreatine in the muscles to help them perform on demand. ![]() ![]() The body converts creatine to phosphocreatine, a form of stored energy used by muscles. ![]() Creatine, one of the best-selling and best-documented supplements for enhancing athletic performance, is a naturally occurring substance that plays an important role in the production of energy in the body.
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