山梨医科大学雑誌　第7巻2号　057-066(1992)

Changes in Sleep Spindle and Sleep Slow Wave during the Menstrual
Cycle

Yoshikazu ISHIZUKA

Abstract: Five healthy adult women, aged from 20 to 28, had 12-15 polysomnographic recordings taken. Sleep stages were scored according to the Rechtschaffen and Kales criteria. Cz-A1 EEG recordings were also analyzed with a spindle and delta wave real-time automatic analyzing system in a 16-bit microcomputer. Sleep stage analysis revealed no significant changes in the ordinary sleep parameters, i.e. percentage of each sleep stage, sleep latency or REM latency when the low and high body temperature phases were compared. On the other hand, the sleep spindle parameters derived from the Personal Spindle Delta-wave Analyzer changed markedly during the menstrual cycle. Spindle frequency was slower at about 14 days before the first menstruation day and increased after that and it was faster at just before the first menstruation day. The pattern of spindle density change was similar to that of frequency. Amplitude and duration did not tend to change during the menstrual cycle nor did the parameters of the slow wave. No prior reports have mentioned the relationship between the menstrual cycle and sleep spindle. From these results, it can be hypothesized that the frequency of the sleep spindle reflects sleep propensity and that it is a very important sleep parameter.

Key words: Sleep, Sleep Spindle, Sleep slow wave, Automatic analysis, Menstrual cycle




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