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The Study of Driving Fatigue using HRV Analysis  

성홍모 (연세대학교 보건과학대학 의공학부)
차동익 (연세대학교 보건과학대학 의공학부)
김선웅 (한국표준과학연구원 인간ㆍ정보그룹)
박세진 (한국표준과학연구원 인간ㆍ정보그룹)
김철중 (한국표준과학연구원 인간ㆍ정보그룹)
윤영로 (연세대학교 보건과학대학 의공학부)
Publication Information
Journal of Biomedical Engineering Research / v.24, no.1, 2003 , pp. 1-8 More about this Journal
Abstract
The job of long distance driving is likely to be fatiguing and requires long period alertness and attention, which make considerable demands of the driver. Driving fatigue contributes to driver related with accidents and fatalities. In this study, we investigated the relationship between the number of hours of driving and driving fatigue using heart rate variability(HRV) signal. With a more traditional measure of overall variability (standard deviation, mean, spectral values of heart rate). Nonlinear characteristics of HRV signal were analyzed using Approximate Entropy (ApEn) and Poincare plot. Five subjects drive the four passenger vehicle twice. All experiment number was 40. The test route was about 300Km continuous long highway circuit and driving time was about 3 hours. During the driving, measures of electrocardiogram(ECG) were performed at intervals of 30min. HRV signal, derived from the ECG, was analyzed using time, frequency domain parameters and nonlinear characteristic. The significance of differences on the response to driving fatigue was determined by Student's t-test. Differences were considered significant when a p value < 0.05 was observed. In the results, mean heart rate(HRmean) decreased consistently with driving time, standard deviation of RR intervals(SDRR), standard deviation of the successive difference of the RR intervals(SDSD) increased until 90min. Hereafter, they were almost unchanging until the end of the test. Normalized low frequency component $(LF_{norm})$, ratio of low to high frequency component (LF/HF) increased. We used the Approximate Entropy(ApEn), Poincare plot method to describe the nonlinear characteristics of HRV signal. Nonlinear characteristics of HRV signals decreased with driving time. Statistical significant is appeared after 60 min in all parameters.
Keywords
Driving fatigue; Hrv; Nonlinear analysis;
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