CAP components and EEG synchronization in the first 3 sleep cycles

Mario Giovanni Terzano, Liborio Parrino, Mirella Boselli, Arianna Smerieri, Maria Cristina Spaggiari

Research output: Contribution to journalArticlepeer-review


Objective: There is consolidated evidence that stage changes in sleep are closely related to spontaneous EEG fluctuations centered on the 20-40 periodicity of the cyclic alternating pattern (CAP). The present investigation aimed at assessing the involvement of the different components of CAP in the process of build-up, maintenance and demolition of deep non-REM (NREM) sleep.Methods: CAP parameters were quantified in the first 3 sleep cycles (SC1, SC2, SC3), selected from polysomnographic recordings of 25 healthy sound sleepers belonging to an extensive age range (10-49 years). Only ideal SCs were selected, i.e. the ones uninterrupted by intervening wakefulness and in which all stages were represented and linked in a regular succession of a descending branch, a trough and an ascending branch.Results: Among the first 3 SCs, a total amount of 45 (SC1, 16; SC2, 13; SC3, 16) met the inclusion requirements. SC1 contained the highest amount of slow wave sleep (43.7 min) and the lowest values of CAP rate (31.6%). The number of phase A1 subtypes remained unmodified across the 3 SCs (SC1, 48; SC2, 48; SC3, 48), whereas both subtypes A2 (SC1, 9; SC2, 14; SC3, 14) and A3 (SC1, 2; SC2, 8; SC3, 10) increased significantly (P

Original languageEnglish
Pages (from-to)283-290
Number of pages8
JournalClinical Neurophysiology
Issue number2
Publication statusPublished - Feb 1 2000


  • Cyclic alternating pattern
  • EEG synchronization
  • Non-rapid eye movement sleep architecture
  • Sleep
  • Sleep cycle

ASJC Scopus subject areas

  • Clinical Neurology
  • Radiology Nuclear Medicine and imaging
  • Neurology
  • Sensory Systems
  • Physiology (medical)


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