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The local cerebral glucose utilization was measured by the 14C deoxyglucose method during spontaneous periods of waking or sleeping in the free-moving Cat. During slow wave sleep there was a 49% increased glucose utilization in choroïd plexuses.

Glucose utilization (GU) was measured during spontaneous waking and slow-wave sleep (SWS) by adaptation of the [14C]deoxyglucose method to the unrestrained cat. In sleeping animals a greater autoradiographic signal between choroid plexus (CP) and the rest of brain was noticed. Quantification provided an index of the metabolic rate of CP and confirmed that mean values for GU were significantly higher in "sleeping' than in "awake' cats.

Local cerebral glucose utilization (LCGU) was measured during spontaneous waking and slow wave sleep (SWS) by an adaptation of the [14C]deoxyglucose method to the free moving cat. In awake animals heterogeneous rates of LCGU were observed throughout the brain with values extending from 8 mumol x 100 g-1 x min-1 for white matter, to 113 for the inferior colliculus. There was no significant difference for LCGU in SWS compared with awake animals.

Local cerebral glucose utilization (LCGU) was measured during spontaneous waking and slow wave sleep (SWS) by adaptation of the [14C] deoxyglucose method to the unrestrained Cat. During waking LCGU ranges from 12 micromoles. 100g-1.mn-1 for white matter to 113 for the inferior colliculus. During SWS most regions exhibit higher levels of LCGU. Thus it appears that there is no decrease of cerebral metabolic activity during SWS in the Cat.