Abstract
We studied the effects of acute hypoxia on the electrical activity of the brain in 32 men 19–45 years old. The state of hypoxia was simulated using gas mixtures with 8% oxygen content in nitrogen for respiration. Integral parameters (IP) characterizing the measure of temporal and spatial (correlation) connectivity of oscillations of potentials were calculated using the structure function of multichannel EEG. The specific changes in IP and generalized EEG spectrum in individuals with different degrees of resistance to hypoxia are described. In the subjects resistant to hypoxia, a number of phases of compensatory reaction in the dynamics of temporary IP were identified, that reflect changes in the functional state of the central nervous system with a general tendency to reduce the level of physiological lability. In the subjects with a low resistance to hypoxia after 3–7 minutes of breathing oxygen-depleted mixture, the sharp shift occurs in the temporal IP value, characterizing the increase in temporal connectivity and inertia in the EEG, a decrease in the functional lability of the central nervous system. We found that spatial and temporal IP of EEG can be used as markers to identify the critical hypoxic threshold for each subject.
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