Creatine monohydrate supplementation on lower-limb muscle power in Brazilian elite soccer players.

Autor: Claudino, João G, Mezêncio, Bruno, Amaral, Sérgio, Zanetti, Vinícius, Benatti, Fabiana, Roschel, Hamilton, Gualano, Bruno, Amadio, Alberto C, Serrão, Julio C
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Zdroj: Journal of the International Society of Sports Nutrition; Dec2014, Vol. 11 Issue 1, p1-6, 6p, 1 Chart, 2 Graphs
Abstrakt: Background: Studies involving chronic creatine supplementation in elite soccer players are scarce. Therefore, the aim of this study was to examine the effects of creatine monohydrate supplementation on lower-limb muscle power in Brazilian elite soccer players (n = 14 males) during pre-season training. Findings: This was a randomized, double-blind, placebo-controlled parallel-group study. Brazilian professional elite soccer players participated in this study. During the pre-season (7 weeks), all the subjects underwent a standardized physical and specific soccer training. Prior to and after either creatine monohydrate or placebo supplementation, the lower-limb muscle power was measured by countermovement jump performance. The Jumping performance was compared between groups at baseline (p = 0.99). After the intervention, jumping performance was lower in the placebo group (percent change = - 0.7%; ES = - 0.3) than in the creatine group (percent change = + 2.4%; ES = + 0.1), but it did not reach statistical significance (p = 0.23 for time x group interaction). Fisher's exact test revealed that the proportion of subjects that experienced a reduction in jumping performance was significantly greater in the placebo group than in the creatine group (5 and 1, respectively; p = 0.05) after the training. The magnitude-based inferences demonstrated that placebo resulted in a possible negative effect (50%) in jumping performance, whereas creatine supplementation led to a very likely trivial effect (96%) in jumping performance in the creatine group. Conclusions: Creatine monohydrate supplementation prevented the decrement in lower-limb muscle power in elite soccer players during a pre-season progressive training. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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