The study was aimed to assess the reactivity of the cardiorespiratory system of young judokas of 12-14 years old, depending on age, health condition and sports specialization. In the longitudinal mode for two years, 32 young athletes were examined. The study was conducted using methods of analyzing heart rate, determining the function of external respiration and the electrolyte composition of saliva. Training loads have a beneficial effect on the body of young judokas, this is expressed in strengthening parasympathetic and stabilizing sympathetic influences in the regulation of heart rhythm in a state of relative rest. This nature of changes in the indicators of the cardiorespiratory system and the electrolyte content was evaluated as the economization of the activity of the heart at rest and the availability of capabilities for performing training loads. Regular physical exercises of young judokas cause positive stimulation of all functional systems, primarily the reactivity of the cardiorespiratory system. The lack of centralization of function control was revealed, which indicates the balance of the autonomous regulation system (sympathetic and parasympathetic divisions of the autonomic nervous system) by the profitability principle. High energy and adaptive capabilities of young judokas indicate the optimal state of regulatory systems. The reactivity of the cardiorespiratory system depends on age, training endurance loads and the individual characteristics of the child's body. In young judokas of 12-14 years old, the leading adaptive-compensatory reaction is an increase in the depth of breathing. The vegetative support system is being improved. The results scientifically substantiate preventive and recreational measures aimed at normalizing the functions of the body.
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