Özet:

Whey Protein supplementation has been widely used by physical activity practitioners. In this context, the objective of this study was to evaluate if Whey Protein supplementation exerts effects on the increase of maximum strength and on the performance of functional tests (Single Hop Test). A randomized clinical trial was conducted with male volunteers. Twelve men in each group completed the inclusion requirements in the study. The first group performed the training protocol and supplemented Whey Protein plus dextrose (GW), while the second group performed the same training protocol and was supplemented with dextrose (GC) alone. The training program with resisted exercises until concentric failure (80% of MRI) lasted for three weeks and frequency of three times a week with a minimum interval of 48 hours between sessions. The participants were evaluated through the functional test (Single Hop Test) and the Maximum Repetition (MR) test. To compare the results, we used the delta (Δ) value obtained from the comparison between the pre- and post-training values ​​(where value-post minus the pre-value = delta value). When normal data were observed, they were analyzed by the t-test. In contrast, the Mann-Whitney test (intergroup) or the Wilcoxon test (intragroup) were used for the non-normal data. A significance level of p<0.05 was considered. According to the results, there was a significant difference between the two groups for functional performance and maximal repetition tests. We can conclude that the use of Whey Protein was effective in improving performance on the Single Hop Test and on the 1 RM test of knee extensors when associated with resistance training until the concentric failure.

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