NERVOUS AND HORMONAL MECHANISMS OF URGENT ADAPTATION OF SCHOOL-AGED CHILDREN TO THE DOSED PHYSICAL STRAIN

Abstract: 

The article presents a comprehensive study of the functional state of sympathoadrenal system (SAS) and the adrenal cortex (АC), their dose-response velosimulator training load stress in seven-to-fifteen –yearold school children with the original tone of the autonomic nervous system (ANS) taken into account. By means of variational pulsometry, fluorometric methods for determining catecholamines (CA) and DOPA in the urine portion, colorimetric methods for investigating the excretion of metabolites of androgens and glucocorticoids, it was found that the nature of the NAC and the SC response is determined by the VNS tonus and is age dependent. The highest reactivity was observed in nine, twelve and thirteen -year-old girls and seven, fourteen and fifteen-year-old boys. In the state of sympathicotonia an increased excretion of adrenaline (A) and noradrenaline (NA) is accompanied by a decrease in DOPA. At the same time in fourteen-year-old boys with ANS disorders physical activity decreases the excretion of sex hormones with an increase of the 17-hydroxycorticosteroid level. This may indicate the predominance of catabolic processes and the low efficiency of switching the organism from the state of activity to recovery.

Key words: 

adaptation, ontogeny, autonomic tone, catecholamines, corticosteroids, physical exercise.

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