Sleep-associated variations in plasma renin activity and blood pressure in the rat.

Abstract:

:Plasma renin activity (PRA) was determined in plasma samples obtained approximately at 6-min intervals during consecutive non-rapid eye movement sleep (NREMS) and rapid eye movement sleep (REMS) periods in rats chronically implanted with EEG electrodes, a brain thermistor, and an intracardiac catheter. PRA was low in REMS and high in NREMS: this difference was statistically significant. The PRAs in wakefulness and NREMS were not different. Sleep-associated variations in systemic blood pressure (BP) were also recorded in a group of rats implanted with a chronic aortic catheter. During REMS, large oscillations superimposed on a tonic rise in BP were observed, and the end of REMS was followed by an abrupt fall in BP. This is the first demonstration of sleep-associated variations in PRA in a species other than man. The changes in BP in the rat during REMS confirm previous reports and, unlike those in many other species, are similar to those previously described in humans. The rat therefore provides a model for study of the mechanisms of the sleep-related variations in PRA and BP. The changes in PRA may reflect a regulatory response to variations in BP or may result from central mechanisms, e.g. the sleep-associated changes in serotonergic activity.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Obál F Jr,Beranek L,Brandenberger G

doi

10.1016/0304-3940(94)90940-7

subject

Has Abstract

pub_date

1994-09-26 00:00:00

pages

83-6

issue

1-2

eissn

0304-3940

issn

1872-7972

pii

0304-3940(94)90940-7

journal_volume

179

pub_type

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