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Department of Environmental Health, Life Science, and Human Technology, Nara Women's University, Kita-Uoya Nishimachi, Nara 630-8506, Japan
The relationship between renal sympathetic nerve activity (RSNA) and systemic arterial pressure obtained during rapid eye movement (REM) sleep was compared with that obtained in other sleep and awake states. Electrodes for the measurements of RSNA, electrocardiogram, electromyogram, and electroencephalogram and a catheter for the measurement of systemic arterial pressure were implanted while the animals were under aseptic conditions at least 5 days before the experiment. During the transition from non-REM (NREM) to REM sleep, RSNA and heart rate (HR) decreased immediately by 46 ± 2% (P < 0.05) and 22 ± 3 beats/min (P < 0.05), respectively, over 3 s after the onset of REM sleep. Meanwhile, systemic arterial pressure increased gradually after the onset of REM sleep, which was apparently independent of the changes in RSNA. During REM sleep, the relationships between RSNA/HR and systemic arterial pressure were dissociated compared with that obtained during the other behavioral states. These data indicate that the interdependency between systemic arterial pressure and RSNA during REM sleep is likely to be modified compared with other behavioral states.
electroencephalogram; heart rate; behavioral states; rapid eye movement
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