Studies on the Electroencephalogram in Ruminants : VII. Brain Temperature, Brain Oxygen Tension and Blood Flow in the Common Carotid Artery during Paradoxical Sleep in Goats

Abstract

EEG, EMG, heart rate, brain temperature, brain pO2 and blood flow in the common carotid artery were observed in 10 goats. Temperature of the neocortex was shown to be at a high level in the phase of low-amplitude fast waves (FW) and at a low level in the phase of high-amplitude slow waves (SW) on the EEG. In the case of paradoxical sleep (PS), however, the temperature rose immediately after the onset of PS and fell to a normal level at the end of PS. The correlation coefficient between the duration of PS and the rise in brain temperature was 0.514 (p<0.001). When temperature (X) and pO2 (Y) in the brain during PS were calculated, the formula of regression line, Y=-0.4118X+0.0038, and the correlation coefficient, r=-0.699 (p<0.001), were presented. The rate of blood flow in the common carotid artery in the phase of SW seemed to have increased a little, as compared with that in the phase of FW. On the other hand, the rate of blood flow in the common carotid artery in the second half of the period of PS decreased by 22%, as compared with that before the onset of this period.