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Physiological react...
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Smith, MichaelGothenburg University,Göteborgs universitet,Institutionen för medicin, avdelningen för samhällsmedicin och folkhälsa, enheten för arbets-och miljömedicin,Institute of Medicine, Department of Public Health and Community Medicine, Section of Occupational and environmental medicine
(författare)
Physiological reaction thresholds to vibration during sleep : Vibrationsnivåer som framkallar fysiologisk reaktion under sömn
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Göteborg :University of Gothenburg,2015
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LIBRIS-ID:oai:gup.ub.gu.se/226146
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ISBN:9789186863081
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http://hdl.handle.net/2077/41118hdl
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https://gup.ub.gu.se/publication/226146URI
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Ämneskategori:vet swepub-contenttype
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Ämneskategori:rap swepub-publicationtype
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Rapportserie AMM Göteborgs universitet
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The World Health Organization Night Noise Guidelines for Europe 2009 report that there is sufficient evidence for biological effects of noise on sleep, starting at LAF,max,inside=32 dB [1]. Alterations in sleep structure and electroencephalogram (EEG) awakenings start to occur at LAF,max,inside=35 dB. Changes in cardiovascular activity during sleep also occur as a result of noise exposure, but threshold levels have not been determined. Noise from freight trains in particular has been found to cause more frequent awakenings [2] and stronger cardiac response [3] than passenger trains. In the field, freight trains are often accompanied by low frequency vibration, with amplitudes commonly around 0.4 – 1.5 mm/s (comfort weighted [4]) near railway lines [5]. As with noise, moderate to high level vibration from freight has been shown to contribute towards cortical EEG reactions and changes of heart rate during sleep [6-8]. However, it is not presently known at what threshold levels physiological effects due to vibration begin to occur. The research group aimed to identify a physiological reaction threshold to vibration during sleep. An initial pilot study was conducted to give a first indication of where such a threshold might lie. A subsequent larger-scale main study further investigated the vibration level response threshold, and also provided knowledge regarding what physiological response occur at 0.4 mm/s, the current lowest limit value enforced for new railway lines in Sweden [9]. Changes in sleep stage and awakenings were observed at 0.4 mm/s, while indications were seen at 0.3 mm/s but not 0.2 mm/s (see Figure 1). Changes in heart rate were seen at 0.3 and 0.4 mm/s, but not at 0.2 mm/s (see Figure 2). This study found that the physiological effects and threshold levels for these WHO defined effects were 0.3 mm/s for changes in cardiac activity, and 0.4 mm/s for EEG awakenings and changes in sleep structure and fragmentation of sleep (see Table 2).
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Ögren, Mikael,1972Gothenburg University,Göteborgs universitet,Institutionen för medicin, avdelningen för samhällsmedicin och folkhälsa,Institute of Medicine, School of Public Health and Community Medicine(Swepub:gu)xogrmi
(författare)
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Persson Waye, Kerstin,1959Gothenburg University,Göteborgs universitet,Institutionen för medicin, avdelningen för samhällsmedicin och folkhälsa, enheten för arbets-och miljömedicin,Institute of Medicine, Department of Public Health and Community Medicine, Section of Occupational and environmental medicine(Swepub:gu)xpeker
(författare)
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Göteborgs universitetInstitutionen för medicin, avdelningen för samhällsmedicin och folkhälsa, enheten för arbets-och miljömedicin
(creator_code:org_t)
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