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• W2066402008 abstract "Modified period analysis was applied to all-night sleep recordings from 14 young adult males. The modifications involved addition of measures of integrated amplitude and of time in frequency band to the zero crossings and zero counts of the first derivative. The analysis was directed toward changes in the characteristics of delta activity (0–3 c/sec) across the night. Delta shifted toward lower frequencies and decreased in amplitude as sleep progressed. These trends were apparent in mean values for successive periods of slow-wave sleep (SSWPs). For epochs of record classified as stage 4 EEG, these trends were seen both within and across SSWPs. The physiological significance of these changes is unknown. We suggest that they may reflect the kinetics of the metabolic processes underlying sleep. Whatever their theoretical significance, the present results provide new, normative features of the sleep EEG which are not evident in sleep stage classification. The trends we observed appear sufficiently reliable to merit empirical investigation as a function of age, clinical state, or the administration of drugs in addition to further studies aimed at determining their biological significance. Une analyse de période modifiée a été appliquée aux enregistrements du sommeil de toute la nuit de 14 jeunes adultes de sexe masculin. Les modifications impliquent l'adjonction de mesures de l'amplitude intégrée et du temps en bande de fréquence par rapport aux croisements de la ligne de base et aux comptages des zéros de la première dérivée. Cette analyse cherche à déceler des modifications des caractèristiques de l'activité delta (de 0–3 c/sec) tout au long de la nuit. L'activité delta évolue vers des fréquences plus basses et diminue d'amplitude au fur et à mesure que le sommeil progresse. Ces tendances apparaissent dans les valeurs moyennes de périodes successives de sommeil à ondes lentes (SSWPs). En ce qui concerne les époques de tracés classés comme stade IV EEG, ces tendances s'observent aussi bien à l'intérieur des SSWPs que d'une SSWPs à l'autre. La signification physiologique de ces modifications est inconnue. Les auteurs font l'hypothèse qu'elle puisse refléter la mouvance des processus métaboliques qui sous-tendent le sommeil. Quelle que soit leur signification thérique, les résultats actuels fournissent des données nouvelles et normatives de l'EEG du sommeil qui ne sont pas évidentes dans la classification en stades de sommeil. Les tendances que les auteurs ont observé paraissent suffisamment fiables pour mériter une investigation empirique en fonction de l'âge, de l'état clinique ou de l'administration de drogues en plus d'études ultérieures tendant à expliciter leur signification biologique." @default.
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• W2066402008 date "1975-07-01" @default.
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• W2066402008 title "Changes in frequency and amplitude of delta activity during sleep" @default.
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• W2066402008 doi "https://doi.org/10.1016/0013-4694(75)90121-2" @default.
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