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Vibration from freight trains fragments sleep: A polysomnographic study.

Smith MG, Croy I, Hammar O, Persson Waye K - Sci Rep (2016)

Bottom Line: Nocturnal trains in particular are of particular importance since night-time exposure may interfere with sleep.In an experimental polysomnographic laboratory study, 24 young healthy volunteers with normal hearing were exposed to simulated freight pass-bys with vibration amplitudes of 0.7 and 1.4 mm/s either 20 or 36 times during the night.Subjects reported sleep disturbance due to vibration (F(4,92) = 25.9, p < 0.001) and noise (F(4,92) = 25.9, p < 0.001), with the number of trains having an effect only for the 0.7 mm/s condition (p < 0.05).

View Article: PubMed Central - PubMed

Affiliation: Department of Occupational and Environmental Medicine, The Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden.

ABSTRACT
As the number of freight trains on railway networks increases, so does the potential for vibration exposure in dwellings nearby to freight railway lines. Nocturnal trains in particular are of particular importance since night-time exposure may interfere with sleep. The present work investigates the impact of vibration and noise from night-time freight trains on human sleep. In an experimental polysomnographic laboratory study, 24 young healthy volunteers with normal hearing were exposed to simulated freight pass-bys with vibration amplitudes of 0.7 and 1.4 mm/s either 20 or 36 times during the night. Stronger vibrations were associated with higher probabilities of event-related arousals and awakenings (p < 0.001), and sleep stage changes (p < 0.05). Sleep macrostructure was most affected in high vibration nights with 36 events, with increased wakefulness (p < 0.05), reduced continual slow wave sleep (p < 0.05), earlier awakenings (p < 0.05) and an overall increase in sleep stage changes (p < 0.05). Subjects reported sleep disturbance due to vibration (F(4,92) = 25.9, p < 0.001) and noise (F(4,92) = 25.9, p < 0.001), with the number of trains having an effect only for the 0.7 mm/s condition (p < 0.05). The findings show that combined vibration and noise from railway freight affects the natural rhythm of sleep, but extrapolation of significance for health outcomes should be approached with caution.

No MeSH data available.


Related in: MedlinePlus

Mean number of spontaneous and event related arousals (A), awakenings (B) and sleep stage changes (C) in all experimental nights. Error bars indicate 95% confidence intervals.
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f3: Mean number of spontaneous and event related arousals (A), awakenings (B) and sleep stage changes (C) in all experimental nights. Error bars indicate 95% confidence intervals.

Mentions: The mean arousals, awakenings and SSCs occurring within each night are presented in Fig. 3. All reactions in the control night happened in the absence of any exposure and are all therefore spontaneous. In the exposure nights, reactions occurring within the analysed 60 s time windows have been considered to be ‘event-related’, i.e. those used in the derivation of Padditional. Reactions occurring outside of these analysis windows have been classed as spontaneous. There were more SSCs in high vibration nights with 36 trains relative to the control (see Table 2). From Fig. 3 can be seen that the number of spontaneous reactions generally seemed to decrease and that event-related SSCs occurred at the expense of these spontaneous reactions. For arousals and awakenings, there was no significant increase in the total number of responses in exposure nights, although event-related reactions generally seemed to occur at the expense of spontaneous reactions similarly to the effect seen with SSCs.


Vibration from freight trains fragments sleep: A polysomnographic study.

Smith MG, Croy I, Hammar O, Persson Waye K - Sci Rep (2016)

Mean number of spontaneous and event related arousals (A), awakenings (B) and sleep stage changes (C) in all experimental nights. Error bars indicate 95% confidence intervals.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4835753&req=5

f3: Mean number of spontaneous and event related arousals (A), awakenings (B) and sleep stage changes (C) in all experimental nights. Error bars indicate 95% confidence intervals.
Mentions: The mean arousals, awakenings and SSCs occurring within each night are presented in Fig. 3. All reactions in the control night happened in the absence of any exposure and are all therefore spontaneous. In the exposure nights, reactions occurring within the analysed 60 s time windows have been considered to be ‘event-related’, i.e. those used in the derivation of Padditional. Reactions occurring outside of these analysis windows have been classed as spontaneous. There were more SSCs in high vibration nights with 36 trains relative to the control (see Table 2). From Fig. 3 can be seen that the number of spontaneous reactions generally seemed to decrease and that event-related SSCs occurred at the expense of these spontaneous reactions. For arousals and awakenings, there was no significant increase in the total number of responses in exposure nights, although event-related reactions generally seemed to occur at the expense of spontaneous reactions similarly to the effect seen with SSCs.

Bottom Line: Nocturnal trains in particular are of particular importance since night-time exposure may interfere with sleep.In an experimental polysomnographic laboratory study, 24 young healthy volunteers with normal hearing were exposed to simulated freight pass-bys with vibration amplitudes of 0.7 and 1.4 mm/s either 20 or 36 times during the night.Subjects reported sleep disturbance due to vibration (F(4,92) = 25.9, p < 0.001) and noise (F(4,92) = 25.9, p < 0.001), with the number of trains having an effect only for the 0.7 mm/s condition (p < 0.05).

View Article: PubMed Central - PubMed

Affiliation: Department of Occupational and Environmental Medicine, The Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden.

ABSTRACT
As the number of freight trains on railway networks increases, so does the potential for vibration exposure in dwellings nearby to freight railway lines. Nocturnal trains in particular are of particular importance since night-time exposure may interfere with sleep. The present work investigates the impact of vibration and noise from night-time freight trains on human sleep. In an experimental polysomnographic laboratory study, 24 young healthy volunteers with normal hearing were exposed to simulated freight pass-bys with vibration amplitudes of 0.7 and 1.4 mm/s either 20 or 36 times during the night. Stronger vibrations were associated with higher probabilities of event-related arousals and awakenings (p < 0.001), and sleep stage changes (p < 0.05). Sleep macrostructure was most affected in high vibration nights with 36 events, with increased wakefulness (p < 0.05), reduced continual slow wave sleep (p < 0.05), earlier awakenings (p < 0.05) and an overall increase in sleep stage changes (p < 0.05). Subjects reported sleep disturbance due to vibration (F(4,92) = 25.9, p < 0.001) and noise (F(4,92) = 25.9, p < 0.001), with the number of trains having an effect only for the 0.7 mm/s condition (p < 0.05). The findings show that combined vibration and noise from railway freight affects the natural rhythm of sleep, but extrapolation of significance for health outcomes should be approached with caution.

No MeSH data available.


Related in: MedlinePlus