A basic study for system to prevent drowse by physiologic indices

Traffic accidents caused by drowsiness have become a large social problem. In this study, we aimed to develop a drowsiness detection system by heart rate variability. Eight subjects particiated in this study. Silent experimental room made them drowsy. The electrocardiogram, the electroencephalogram,...

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Bibliographic Details
Published inJournal of Advanced Science Vol. 20; no. 1+2; pp. 1 - 6
Main Authors FUKUMOTO, Ichiro, MIYAZAWA, Takumi
Format Journal Article
LanguageJapanese
Published Society of Advanced Science 2008
Subjects
Drowsiness
Electrocardiogram
Electroencephalogram
Heart rate fluctuation
R-R interval
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ISSN0915-5651
1881-3917
DOI10.2978/jsas.20.1

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Summary:Traffic accidents caused by drowsiness have become a large social problem. In this study, we aimed to develop a drowsiness detection system by heart rate variability. Eight subjects particiated in this study. Silent experimental room made them drowsy. The electrocardiogram, the electroencephalogram, the electro-oculogram, the respiration and the pulse wave were measured as physiological indices. The sampling frequency was 2,000 Hz. Video pictures of subjects were taken to monitor their body motion and aspect. Simultaneously, Visual Analog Scale (VAS) was used as a subjective assessment. Heart rate fluctuation was detected using the variance of threshold level that was set by the R-R intervals. The detected zone of drowsy state was assessed by the electroencephalogram and the electro-oculogram. It was only six subjects. Tow subjects could not detect the heart rate fluctuation. The variance of threshold level needs to be improved. We proposed drowsiness detection system using the simple threshold level. This system suggested the possibility to detect the drowsy state.
ISSN:0915-5651
1881-3917
DOI:10.2978/jsas.20.1