title: Anteroposterior difference in EEG sleep depth measure is reduced in apnea patients.
abstract: In the present work, mean frequencies of FFT amplitude spectra from six EEG derivations were used to provide a frontopolar, a central and an occipital sleep depth measure. Parameters quantifying the anteroposterior differences in these three sleep depth measures during the night were also developed. The method was applied to analysis of 30 all-night recordings from 15 healthy control subjects and 15 apnea patients. Control subjects showed larger differences in sleep depth between frontopolar and central positions than the apnea patients. The relatively reduced frontal sleep depth in apnea patients might reflect the disruption of the dynamic sleep process caused by apneas.
authors.affiliation: Signal Processing Laboratory, Tampere University of Technology, Korkeakoulunkatu 1, FIN-33101, Tampere, Finland. eero.huupponen@tut.fi
authors.forename: Eero
authors.initials: E
authors.lastname: Huupponen
authors.forename: Antti
authors.initials: A
authors.lastname: Saastamoinen
authors.forename: Atte
authors.initials: A
authors.lastname: Joutsen
authors.forename: Jussi
authors.initials: J
authors.lastname: Virkkala
authors.forename: Jarmo
authors.initials: J
authors.lastname: Alametsä
authors.forename: Joel
authors.initials: J
authors.lastname: Hasan
authors.forename: Alpo
authors.initials: A
authors.lastname: Värri
authors.forename: Sari-Leena
authors.initials: SL
authors.lastname: Himanen
mesh_terms: D000328:Adult; D001921:Brain / Q000503:physiopathology*; D004569:Electroencephalography; D005260:Female; D005583:Fourier Analysis; D006801:Humans; D008297:Male; D008875:Middle Aged; D017286:Polysomnography; D012890:Sleep; D012891:Sleep Apnea Syndromes / Q000503:physiopathology*