Training of young athletes in modern conditions is characterized by the use of increased volumes and high intensity of training loads. The educational and training process in various sports involves the use of various schemes and approaches to training. The article identifies the physiological mechanisms of reactions of the body of young athletes to the muscular activity of the main energy systems. Such an approach is necessary for the scientific support of planning training programs at different stages of preparation. The study involved young athletes specializing in swimming and water polo. As part of the natural training process, a three-stage comprehensive examination was carried out for each specialization. The aim of the work was to identify individual adaptations of the athlete's body to physical exertion. As a result of the study, it was found that swimmers and water polo players demonstrate certain differences in the ratio of aerobic and anaerobic energy supply during intense muscle work. This is explained by differences in the focus of the training process and the specifics of their motor activity. Analysis of the study results revealed four main options for individual adaptation of the body of young athletes to physical exertion. This approach allowed for adjustments to individual training plans.
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