The aim of this study was to analyze the effect of futsal training on variables related to body composition and physical performance in student-athletes. This longitudinal study was based on a 12-week training program, and the sample consisted of 34 futsal players in the U17 and U19 categories, competing in a regional championship 2023-2024. The players trained for 240 minutes a week, divided into three training sessions. Body composition (BC) was assessed by measuring skinfolds using an adipometer, and the Futsal Intermittent Endurance Test (FIET) was applied. The Shapiro-Wilk test was used, and the pre- and post-intervention values were analyzed using the Wilcoxon test. The differences were classified according to the effect size for the Wilcoxon test (r). In terms of body composition, height showed a significant increase with a large effect (p<0.01) after the 12 weeks of training, as did body mass (p<0.01) and lean mass (p<0.01). On the other hand, fat mass showed a significant and large-effect reduction in both absolute (p<0.01) and relative (p<0.01) measures. Regarding physical performance, peak velocity showed a significant increase with a large effect (p<0.01), and the FIET distance showed the same tendency (p<0.01). The findings of the present study indicate significant and beneficial changes in both anthropometric measures and physical performance parameters in U17 and U19 athletes after a 12-week futsal training program.
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