The aim of this study was to determine differences in hydration status before and after a judo training session. The sample of participants included boys (N = 60) and girls (N = 35) aged 11–14 years. The variables used as indicators of hydration status were body weight (BW), body mass index (BMI), fat mass (FM), and total body water (TBW). Based on mean values obtained after training, body weight decreased by 0.78 kg in girls and 0.54 kg in boys. Body mass index decreased by 0.39 in girls and 0.45 in boys, while fat mass decreased by 0.52 kg in girls and 0.18 kg in boys. Finally, the reduction in total body water amounted to 0.72 in boys and 0.28 in girls. Statistical significance was confirmed using a t-test for changes in body weight, body mass index, and total body water. Based on the findings of this study, it can be concluded that the introduction of scheduled rehydration breaks during training may reduce fluid loss and help preserve muscular strength in young judo athletes.
Keywords: martial arts, exercise, rehydration, fluid intake, health status
