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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 rating of self-reported sleep disturbance from noise and vibration during the exposure nights, recorded immediately after awakening.Error bars indicate 95% confidence intervals.
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f4: Mean rating of self-reported sleep disturbance from noise and vibration during the exposure nights, recorded immediately after awakening.Error bars indicate 95% confidence intervals.

Mentions: Results from the morning questionnaires are presented in Supplementary Table 1. No effects of exposure night presentation ordering were found. The exposure conditions had an impact on sleep disturbance from vibrations (F(4, 92) = 25.9, p < 0.001, Fig. 4). Participants reported higher sleep disturbance by vibration in all exposure nights as compared to the control (p < 0.01). In nights with moderate vibration there was an effect of the number of trains (p < 0.05), with participants being more disturbed by vibration in exposure conditions with a higher number of events.


Vibration from freight trains fragments sleep: A polysomnographic study.

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

Mean rating of self-reported sleep disturbance from noise and vibration during the exposure nights, recorded immediately after awakening.Error bars indicate 95% confidence intervals.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f4: Mean rating of self-reported sleep disturbance from noise and vibration during the exposure nights, recorded immediately after awakening.Error bars indicate 95% confidence intervals.
Mentions: Results from the morning questionnaires are presented in Supplementary Table 1. No effects of exposure night presentation ordering were found. The exposure conditions had an impact on sleep disturbance from vibrations (F(4, 92) = 25.9, p < 0.001, Fig. 4). Participants reported higher sleep disturbance by vibration in all exposure nights as compared to the control (p < 0.01). In nights with moderate vibration there was an effect of the number of trains (p < 0.05), with participants being more disturbed by vibration in exposure conditions with a higher number of events.

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