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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[Jul]; 54 (4): 296-307 PMID26829971show 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.