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Background of Study

            Most
of athletes use nutritional ergogenic aids in an attempt to improve both the
quality and the quantity of training and to enhance their performance during
competition. Indeed, under specific conditions many sporting ergogenic aids
have been shown to have positive effects on athletic performance, body
composition and strength and it is possible that ingestion of additional
nutrients may be necessary during high intensity exercise to allow for maximal
expression of endurance and strength gains.

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Creatine (Cr) is the most popular
dietary supplement in sports nutrition, because it determines the level of
muscle phosphocreatine. Oral Cr supplementation can elevate human skeletal
muscle creatine by 10-30%. The ergogenic e?ects
of Cr supplements have been declared in particular anaerobic and repeated
sprint exercises with resistance training over increases in power and lean
mass. The benefits of Cr ingestion have been mostly attributed to the consequent
restore in phosphocreatine (PCr) content in muscle. Most studies investigating
the effect of Cr supplementation on exercise performance have used a loading scheme,
by ingesting a dose of 20-25 g/day for 4-5 days. This scheme, also known as
“acute Cr loading”, regulates total muscle creatine and phosphocreatine to a
point considered necessary to improve exercise performance. Several studies to
date have revealed beneficial effects of both chronic and acute of Cr
supplementation on power, speed and strength in athletes. More recent research
suggests that creatine supplementation in amounts of 0.1 g/kg of body weight
combined with resistance training improves training adaptations at a cellular
and sub-cellular level. A scientific studies by Stone et al. (2003), McGuine et
al. (2002) and Zuniga et al. (2012) have show that Cr supplements provide an
ergogenic aid in activities involving repeated bouts of high intensity
anaerobic performance. To close, the purpose of this study is to observe the
effects of creatine supplements on aerobic and anaerobic performance.

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