The aim of this master's thesis was to investigate the association between changes in brain-derived neurotrophic factor (BDNF) concentration and Stroop Color and Word Test performance following a strength training session. Seventeen healthy, moderately physically active men aged 18 to 30 years participated in the study. All measurements were conducted in the Kinesiology Laboratory at the Faculty of Sport, University of Ljubljana. Participants completed a strength training protocol consisting of four sets performed to muscular failure with 2-minute rest intervals between sets and exercises, which was compared with a control protocol involving no exercise. Both protocols included administration of the Stroop test, and blood samples were collected at two time points to determine BDNF concentrations. The results showed improved performance across all Stroop test conditions following the interventions, with the greatest relative improvement observed in the incongruent condition. Relative changes in Stroop test performance were greater following the strength training protocol than after the control protocol. BDNF concentrations increased significantly after both the strength training and the control protocol. No statistically significant associations were found between the relative changes in Stroop test performance and the relative changes in BDNF concentration following the control protocol. Although a positive association between the relative changes in Stroop test performance and the relative changes in BDNF concentration was hypothesized following the trength training protocol, no statistically significant relationships were observed. The improvement in cognitive performance was therefore most likely mediated by other mechanisms than changes in circulating BDNF concentration.
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