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Sleep spindle characteristics and arousability from nighttime transportation noise exposure in healthy young and older individuals.
- Source :
-
Sleep [Sleep] 2018 Jul 01; Vol. 41 (7). - Publication Year :
- 2018
-
Abstract
- Study Objectives: Nighttime transportation noise elicits awakenings, sleep-stage changes, and electroencephalographic (EEG) arousals. Here, we investigated the potential sleep-protective role of sleep spindles on noise-induced sleep alterations.<br />Methods: Twenty-six young (19-33 years, 12 women) and 18 older (52-70 years, 9 women) healthy volunteers underwent a repeated measures polysomnographic 6-day laboratory study. Participants spent one noise-free baseline night, followed by four transportation noise-exposure nights (road traffic or railway noise; continuous or intermittent: average sound levels of 45 dB, maximum sound levels of 50-62 dB), and one noise-free recovery night. Sleep stages were scored manually and fast sleep spindle characteristics were quantified automatically using an individual band-pass filtering approach.<br />Results: Nighttime exposure to transportation noise significantly increased sleep EEG arousal indices. Sleep structure and continuity were not differentially affected by noise exposure in individuals with a low versus a high spindle rate. Spindle rates showed an age-related decline along with more noise-induced sleep alterations. All-night spindle rates did not predict EEG arousal or awakening probability from single railway noise events. Spindle characteristics were affected in noise-exposure nights compared to noise-free nights: we observed a reduction of the spindle amplitude in both age groups and of the spindle rate in the older group.<br />Conclusions: We have evidence that spindle rate is more likely to represent a trait phenomenon, which does not seem to play a sleep-protective role in nighttime transportation noise-induced sleep disruptions. However, the marked reduction in spindle amplitude is most likely a sensitive index for noise-induced sleep alterations.
Details
- Language :
- English
- ISSN :
- 1550-9109
- Volume :
- 41
- Issue :
- 7
- Database :
- MEDLINE
- Journal :
- Sleep
- Publication Type :
- Academic Journal
- Accession number :
- 29697833
- Full Text :
- https://doi.org/10.1093/sleep/zsy077