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From Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan.
We microneurographically recorded muscle sympathetic nerve activity (MSA) during sleep in 12 healthy volunteers while simultaneously recording EEC, EOG, ECG, respiration, and blood pressure and determined the number of pulse-synchronous MSA bursts per minute (burst rate) for non-rapid eye movement (nonREM) sleep and rapid eye movement (REM) sleep. MSA decreased during nonREM sleep with progressively deeper sleep stages. During REM sleep, the burst rate of MSA increased and was associated with marked fluctuations in arterial blood pressure. During sleep stage 2, MSA bursts occurred approximately 1 second after spontaneous K-complexes. We conclude that (1) the decreases in MSA during nonREM sleep stages may indicate sleep-stage dependent central suppression of MSA activity; (2) increases in MSA during REM sleep suggest instability of the autonomic nervous system; and (3) a common pathway may exist for MSA bursts and K-complexes.
Address correspondence and reprint requests to Dr. Satoshi Iwase, Research Institute of Environmental Medicine, Nagoya University, Nagoya 464-01, Japan.
Received February 5, 1991. Accepted for publication in final form May 13, 1991.
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