Gender difference of slow wave sleep in middle aged and elderly subjects

Psychiatry Clin Neurosci. 1999 Apr;53(2):151-3. doi: 10.1046/j.1440-1819.1999.00508.x.


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.

MeSH terms

  • Aged
  • Aging / physiology*
  • Cerebral Cortex / physiology
  • Circadian Rhythm / physiology*
  • Female
  • Fourier Analysis
  • Humans
  • Male
  • Middle Aged
  • Polysomnography
  • Reference Values
  • Sex Characteristics*
  • Signal Processing, Computer-Assisted
  • Sleep Stages / physiology*
  • Sleep, REM / physiology