In the world of sports, the growing competiveness has led athletes and scientists through a search for other means to achieve a better performance, in addition to the new trends in physical training methodology. Such methods are known as Ergogenic Aids (Willians; Branch, 1998), among which it is creatine intake. These aids can be used in combat, since in many situations it requires the same physical gestures and performance similar to sports. What would be the infl uence caused the oral monohydrated creatine intake over the physical performance of military people under exhausting four-day continuous combat operations (CCO)? With the aim at answering such a question, a group of 32 volunteer male military, aged (X±dp) 21.97%±2.19 went through CCO simulations during four days under the following protocol: Group (Gr1) received 20g of creatine, seeing that n=12; Group 2 (Gr2) received a mixture of 20g of creatine and 160g of maltodextrin, seeing that n=9; Group 3 (Gr3) did not receive any type of supplement, seeing that n=11. The dependent variables of physical performance Ratio of Perceived Exertion (RPE), Lean Body Mass (LBM), Strength Power (SP), Anaerobic Muscle Endurance (AME) and Alactic Anaerobic Power (ALP) were evaluated in the previous and pre-and post-tests and then compared. After CCO, Gr1 and Gr2 were expected to show a smaller but signifi cant decrease (p<0.05) when compared to Gr3 in its physical performance. Creatine intake might justify this fact. However, there was no signifi cant difference among the groups in relation to the analyzed variables. Therefore, it was concluded that creatine intake did not produce any ergogenic signifi cant effect in the analyzed samples.

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