[Blood flow and pO2 in the posterior hypothalamus of cats during paradoxical sleep].

In chronic experiments on cats it has been found by recording of the brain local blood flow (BLBF) and of oxygen tension (pO2) in the posterior and anterior hypothalamus, that at sleep phases alternation, the changes of these parameters are differently directed: during the paradoxical sleep the level of BLBF and pO2 oscillations frequency increased in the posterior hypothalamus and decreased in the anterior one. During slow-wave sleep opposite relations were observed. Opposite directions of changes of BLBF level and pO2 oscillations frequency in one and the same phase of sleep show that they are of local origin and must be determined by functional-metabolic shifts. In particular, the increase of BLBF level and frequency of pO2 oscillations must reflect a rise of posterior hypothalamus functional-metabolic activity during paradoxical sleep.