The cardiovascular system of children is one of the most dynamic physiological systems, constantly adjusting to the body’s developmental needs and environmental challenges. Its functional state reflects the degree of adaptation to internal and external conditions such as physical activity, climate, altitude, nutrition, and psycho-emotional stress. Children living under different adaptation conditions demonstrate characteristic cardiovascular responses, which indicate the efficiency of autonomic regulation, myocardial function, and vascular tone. This article analyzes the clinical and functional features of the cardiovascular system in children subjected to varying adaptive environments. It discusses the physiological mechanisms of adaptation, factors influencing cardiovascular reactivity, diagnostic parameters, and clinical signs of maladaptation. Special attention is paid to preventive measures that ensure optimal cardiovascular development and long-term health in the pediatric population.

Cardiovascular system, children, adaptation, hemodynamics, autonomic regulation, heart rate variability, hypoxia, stress, physical activity.

Guyton, A. C., Hall, J. E. Textbook of Medical Physiology. 15th ed. Philadelphia: Elsevier, 2021.

McCrindle, B. W., et al. Pediatric Cardiovascular Physiology and Adaptation. Circulation. 2023;148(3):210–226.

Kuznetsova, O. I., et al. Functional adaptation of the cardiovascular system in children under environmental stress. Human Physiology. 2022;48(3):276–284.

Fagard, R., Cornelissen, V. Physical activity and cardiovascular function in youth. Eur J Appl Physiol. 2023;123(2):295–308.

Platonov, P. G. Autonomic Regulation of the Heart in Children. Moscow: GEOTAR-Media, 2020.

Smith, C. J., et al. Environmental adaptation and cardiovascular health in childhood. Front Pediatr. 2024;12:1162398.