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Spontaneous K-complexes in chronic psychophysiological insomnia
- Source :
-
Journal of Psychosomatic Research . Aug2009, Vol. 67 Issue 2, p117-125. 9p. - Publication Year :
- 2009
-
Abstract
- Abstract: Objective: Spontaneous K-complexes are electroencephalographic features unique to non-rapid eye movement sleep. It has been suggested that this phasic event is a sleep-protective mechanism. Because insomnia sufferers report poor sleep quantity and quality, the objective of this study was to document the occurrence of spontaneous K-complexes in Stage 2 sleep of individuals with chronic insomnia. Specifically, the number and density of spontaneous K-complexes were studied in psychophysiological insomnia sufferers. Setting: This study took place in a sleep and event-related potentials laboratory. Design: Spontaneous K-complexes were scored during Stage 2 sleep on the second and third nights of a four-consecutive-nights protocol of polysomnographic recordings. Participants: The sample included 14 participants suffering from psychophysiological insomnia (INS group; mean age=44.1 years) and 14 good sleepers (mean age=38.1 years). Participants underwent sleep and psychological evaluations. INS group participants met the diagnostic criteria for primary psychophysiological insomnia (mean duration of insomnia=9.6 years). Intervention: Not applicable. Results: The total number of spontaneous K-complexes and the density according to the total time spent in Stage 2 sleep (spontaneous K-complexes per minute) were compiled. Repeated-measures analyses of variance showed no significant difference in the number and density of spontaneous K-complexes between the INS group (313.98 and 2.66) and the GS group (361.10 and 2.88), respectively. Conclusion: These results suggest no deficiency in the sleep-protective mechanism of psychophysiological insomnia sufferers in comparison with good sleepers, as measured by the spontaneous K-complexes'' number and density. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00223999
- Volume :
- 67
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Journal of Psychosomatic Research
- Publication Type :
- Academic Journal
- Accession number :
- 43311740
- Full Text :
- https://doi.org/10.1016/j.jpsychores.2009.01.014