Gender difference of slow wave sleep in middle aged and elderly subjects.
Sleep EEG of eight healthy males and eight females aged 54-72 years were recorded at their homes. The electroencephalograms were visually scored and analyzed by spectral analysis using the FFT method. There were no significant differences in sleep parameters except for a higher percentage of stage 3+4 in females. The spectral power of the delta band EEG was classified into two frequencies: 0.5-2 Hz and 2-4 Hz. The total amount of the delta band spectral power through the night was significantly larger in females. Periodic fluctuation of delta band power was observed in females along with non-rapid eye movement-rapid eye movement cycles.
Fukuda
N
N
Department of Laboratory Technology, College of Medical Technology Hokkaido University, Sapporo, Japan.
Honma
H
H
Kohsaka
M
M
Kobayashi
R
R
Sakakibara
S
S
Kohsaka
S
S
Koyama
T
T
D000368:Aged; D000375:Aging / Q000502:physiology*; D002540:Cerebral Cortex / Q000502:physiology; D002940:Circadian Rhythm / Q000502:physiology*; D005260:Female; D005583:Fourier Analysis; D006801:Humans; D008297:Male; D008875:Middle Aged; D017286:Polysomnography; D012016:Reference Values; D012727:Sex Characteristics; D012815:Signal Processing, Computer-Assisted; D012894:Sleep Stages / Q000502:physiology*; D012895:Sleep, REM / Q000502:physiology