[Dynamics of changes in the cerebral and erythrocyte ATPase activity of rats with hypoxic hypoxia].

A long-term (for 3 hours) hypoxic hypoxia was accompanied in rats by wave changes of the brain tissue Na++K+-ATPase activity. This activity decreased after a 15-minute exposure; it increased after 2 hours and fell again after a 3-hour hypoxia (decompensation period). The membrane transport enzymes of erythrocytes proved to be more resistant to hypoxia than the brain cell enzymes.