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2016 ; 54
(4
): 296-307
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The influence of vibration on seated human drowsiness
#MMPMID26829971
Azizan A
; Fard M
; Azari MF
; Benediktsdóttir B
; Arnardóttir ES
; Jazar R
; Maeda S
Ind Health
2016[Aug]; 54
(4
): 296-307
PMID26829971
show ga
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.