| 1. |
- Nilsonne, G., et al.
(författare)
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Increased global FMRI signal variability after partial sleep deprivation : Findings from the Stockholm sleepy brain study
- 2017
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Ingår i: SLEEP. - : Oxford University Press (OUP). - 0161-8105 .- 1550-9109. ; 40, s. A40-A40
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Konferensbidrag (refereegranskat)abstract
- Introduction: Neural correlates of sleep deprivation are not fully understood and the difference between young and older adults in this regard has received little attention. We aimed to investigate the effect of partial sleep deprivation on resting state connectivity.Methods: 30 younger (20–30 years) and 23 older (65–75 years) healthy participants underwent MR imaging after normal sleep and partial sleep deprivation (3 h sleep). We acquired two runs of eyes-open resting state functional magnetic resonance images. Participants were monitored with eye-tracking to ensure their eyes remained open during scanning.Results: Global signal variability, defined as log-transformed standard deviation of average gray matter signal, was increased following partial sleep deprivation (0.16 [0.07, 0.24], p = 0.0004). In contrast to previous studies, we did not find that partial sleep deprivation inhibited connectivity in the default mode network, nor in other major networks investigated.Conclusion: Sleep deprivation caused increased global signal variability. This novel finding should be confirmed using independent data. Our finding of no difference in default mode connectivity in the sleep deprived state, could possibly be due to stricter monitoring of participants’ wakefulness compared to some earlier studies.
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| 5. |
- Kecklund, G, et al.
(författare)
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Sleep in a truck berth
- 1997
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Ingår i: Sleep. - : Oxford University Press (OUP). - 0161-8105 .- 1550-9109. ; 20:8, s. 614-619
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Tidskriftsartikel (refereegranskat)
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| 6. |
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| 7. |
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| 8. |
- Åkerstedt, T, et al.
(författare)
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Manifest sleepiness and the spectral content of the EEG during shift work
- 1991
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Ingår i: Sleep. - 0161-8105 .- 1550-9109. ; 14:3, s. 221-225
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Tidskriftsartikel (refereegranskat)abstract
- Twenty-five three-shift workers in a process industry were subjected to ambulatory polysomnography during one afternoon and one night shift. The electroencephalographic (EEG) recordings were analyzed with spectral analysis. Subjective sleepiness increased during the night work but did not reach an extreme level. Five subjects fell asleep during night work and the involuntary naps were preceded by a few minutes of increased alpha (8-11.9 Hz) power density. Alpha and theta activity occurred in very short bursts. The hourly mean EEG alpha power density increased significantly but moderately during the night shift and correlated with subjective ratings of sleepiness. Theta power density (4-7.9 Hz) did not increase during the night shift, nor did it correlate with subjective sleepiness. It was suggested that the shift workers could prevent much of the polysomnographic manifestations of sleepiness by various types of activity (including succumbing to sleep). It was also suggested that averaging power density values across long time periods might not be an optimal strategy for detection of sleepiness, but rather some method of emphasizing the occurrence of alpha or theta bursts.
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| 9. |
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| 10. |
- Akerstedt, TG, et al.
(författare)
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Sleep and burnout
- 2002
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Ingår i: SLEEP. - 0161-8105. ; 25, s. A403-A403
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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