Comparative Analysis of Brain Bioelectrical Activity and Circulatory Supply in Adolescents With Acute Hypoxia

Abstract

Brain bioelectrical activity and the degree of cerebral blood supply directly determine physiological brain activity. There is insufficient evidence on the regularity and continuity of these processes.
 The aim of the study is to conduct a comparative analysis of brain bioelectrical activity and circulatory supply in adolescents with acute hypoxia.
 Materials and Methods. The authors examined 100 adolescent males of two age groups: Group 1 consisted of boys aged 12–14 years old, Group 2 included those aged 15–17.
 Results. The authors revealed a positive correlation between blood supply, metabolism and brain function. In early pubertal adolescents, puberty-associated endocrine changes have a significant effect on EEG and REG indices in adolescents with hypoxia. An increase in the rheographic index is accompanied by an increase in the alpha- and a decrease in the delta-rhythm indices. In pubertal adolescents, an increase in the rheographic index causes a decrease in alpha rhythm and an increase in slow-wave delta oscillations in the frontal and occipital leads. Under short-term hypoxia, an increase in the brain filling with blood is observed. Under oxygen depletion (14%), despite the increase in pulmonary and blood minute volumes, tissue hypoxia develops in pubertal adolescents. It is especially evident in the early puberty, as there is even a decrease in oxygen consumption in adolescents aged 12–14. In adolescents with hypoxia cerebral blood flow increases.