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BACKGROUND AND AIMS High-intensity exercise modalities such as Crossfit have increased the number of practitioners due to the benefits such as weight loss. However, high-intensity exercise can induce renal and endothelial damage. The objective was to verify the main acute effects of high-intensity exercise on renal and endothelial function of Crossfit athletes. METHOD The study was conducted by evaluating 10 high-performance Crossfit athletes, performing pre- and 24-h post-competition test collection. The athletes were evaluated using biomarkers for kidney injury, such as lipocalin associated with neutrophil gelatinase (NGAL), creatine kinase (CK), albumin, creatinine and estimated glomerular filtration rate (eGFR). Endothelial damage was evaluated using serum enzymatic markers, intercellular adhesion molecule-1 (ICAM-1), vascular adhesion molecule-1 (VCAM-1) and Syndecan-1. In addition, athletes' physical and social evaluation questionnaires measuring body composition data and socioeconomic conditions were used. Statistical analysis was performed with Shapiro-Wilk and Student t test for parametric values and Wilcoxon for non-parametric data. Pearson and Spearman tests were used for data with normality and non-normality, respectively. RESULTS There was a significant increase in creatinine (1.03 ± 0.24 versus 1.36 ± 0.34 mg/ dL, P = .001) and CK [median 302.40 (115.75–474.00) versus 2048.80 (542.75–3391.25) U/L, P = .005] 24 h after the activity, and reduced eGFR (91.55 ± 21.15 versus 66.45 ± 20.6  mL/min/1.73 m², P = .000). The values of ICAM-1, VCAM-1, Syndecan-1 and NGAL did not show statistically significant variations. There was a strong positive correlation between syndecan-1 and CK (P = .000, r = 0.953). CONCLUSION The study showed that high performance exercise performed by athletes does not cause significant acute changes in renal function, but its intensity was able to cause muscle damage and endothelial changes in the participants.

The present study aimed to identify the main motivational factors that lead adults to seek physical activity practices in gyms and their relationship with gender and BMI. The study had a quantitative, analytical, cross-sectional and randomized characteristic and was held in 4 physical training centers. In a population of 550 individuals, the sample consisted of 134, adults of both sexes, bodybuilding practitioners. As a tool and collection, a questionnaire from Meneguzzi and Voser (2011) was used to verify the motivational aspects for the practice of physical activity. For data homogeneity and normality, the Levene and Kolmogorov-Smirnov test were used, respectively. To verify the association between qualitative data, the chi-square test was used. A 95% confidence interval was adopted, reflecting a value of p<0.05. The research participants were adults of both sexes with an average age of (30.7+9.11years) and a BMI of (25.29+3.4kg/m 2). The sample consisted of 49.25% men (n=66) and 50.75% women (n=68). There was no association between BMI and gender with motivational factors for the practice of strength training (p>0.05). With the exception of "social integration", in all other factors the "extremely important" option was evident in most groups. We concluded in this study that, as a motivational factor, the majority of adults consider conditioning, aesthetics, health and anxiety control to be the practice of resistance training, as well as the different BMI and gender do not influence these responses.

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