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Identification of the body fat (BF) percentage allows health professionals to detect healthy or risky patterns in a population. However, no studies have elaborated BF cutoff points using the bioelectrical impedance method in young Brazilian adults. Thus, the objective of the present study was to elaborate normative tables for BF in Brazilian men and women (sedentary and physically active) between 18 and 39 years of age. A total of 3,111 adults (958 men and 2,153 women) were evaluated using bioimpedance measurements with the InBody 520 device. The data were distributed normally and divided into percentiles (P 3 , P 10 , P 25 , P 50 , P 75 , P 90 , and P 97 ). The following values were observed: for men: P 3 =8.9%-12.5%; P 10 =12.6%-17.5%; P 25 =17.6%-25.3%; P 50 =25.4%-35.1%; P 75 =35.2%-43.0%; P 90 =43.1%-49.4% and P 97 =49.5%; for women: P 3 =18.7%-23.1%; P 10 =23.2%-28.7%; P 25 =28.8%-35.7%; P 50 =35.8%-42.9%; P 75 =43.0%-49.1%; P 90 =49.2%-52.1% and P 97 ≥52.2%. These percentiles can be used to classify the adiposity of sedentary and physically active individuals evaluated by bioimpedanciometry., Competing Interests: CONFLICT OF INTEREST No potential conflict of interest relevant to this article was re ported.

The purpose of this study was to evaluate the effects of N-acetylcysteine (NAC) supplementation on cellular damage and oxidative stress indicators in volleyball athletes. Twenty male volleyball athletes at national level performed a physical training session and were divided into 2 groups, which for 7 days took the placebo substance or NAC. After 7 days the athletes repeated the same training session. In both sessions, blood samples were collected 30 min before and immediately after the training session to measure cellular damage and oxidative stress markers. The main results show that, although higher concentrations of glutathione peroxidase and superoxide dismutase were observed in post-session 1 than those in postsession 2, the other markers showed an increase in antioxidant action after supplementation of NAC, once the effect of experimental conditions ( P =0.030) were observed in: time effect ( P <0.001) and interaction ( P =0.019) for total glutathione; time effect ( P <0.001) and interaction ( P <0.001) for reduced glutathione; and time effect ( P <0.001) for ferric-reducing antioxidant potential. The oxidant action indicated by the protein carbonyl was higher in the placebo group than in the NAC group ( P =0.028), but a time effect ( P <0.001) for the thiobarbituric acid reactive substances showed lower values in presession 1 than in presession 2. For the cellular damage markers, antagonistic results between markers were found. Based in the results, the supplementation of NAC during a short period was effective in reducing oxidant action and increasing antioxidant action. However, conclusive alterations in the responses of the cellular damage markers were not obtained., Competing Interests: CONFLICT OF INTEREST No potential conflict of interest relevant to this article was reported.