title: The influence of vibration on seated human drowsiness.
abstract: Although much is known about human body vibration discomfort, there is little research data on the effects of vibration on vehicle occupant drowsiness. A laboratory experimental setup has been developed. Vibration was applied to the volunteers sitting on the vehicle seat mounted on the vibration platform. Seated volunteers were exposed to a Gaussian random vibration, with 1-15 Hz frequency bandwidth at 0.2 ms(-2) r.m.s., for 20-minutes. Two drowsiness measurement methods were used, Psychomotor Vigilance Test (PVT) and Karolinska Sleepiness Scale (KSS). Significant changes in PVT (p<0.05) and KSS (p<0.05) were detected in all eighteen volunteers. Furthermore, a moderate correlation (r>0.4) was observed between objective measurement (PVT) and subjective measurement (KSS). The results suggest that exposure to vibration even for 20-minutes can cause significant drowsiness impairing psychomotor performance. This finding has important implications for road safety.
authors.affiliation: School of Aerospace Mechanical and Manufacturing Engineering, RMIT University, Australia.
authors.forename: Amzar
authors.initials: A
authors.lastname: Azizan
authors.forename: Mohammad
authors.initials: M
authors.lastname: Fard
authors.forename: Michael F
authors.initials: MF
authors.lastname: Azari
authors.forename: Bryndís
authors.initials: B
authors.lastname: Benediktsdóttir
authors.forename: Erna Sif
authors.initials: ES
authors.lastname: Arnardóttir
authors.forename: Reza
authors.initials: R
authors.lastname: Jazar
authors.forename: Setsuo
authors.initials: S
authors.lastname: Maeda
mesh_terms: D006801:Humans; D008297:Male; D018986:Motor Vehicles; D011187:Posture; D011597:Psychomotor Performance / Q000502:physiology; D012894:Sleep Stages / Q000502:physiology*; D014732:Vibration; D014851:Wakefulness; D055815:Young Adult
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