NIRS-based experimental evaluation of driver back fatigue during long-term driving

Most research on the relationship between driver fatigue, driving comfort, stability and other factors related to driving has consisted subjective assessments via surveys. Bio-signal measurements allow more objective evaluations but the measurement processes and types are very complicated, and measu...

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Bibliographic Details
Published in:Biotechnology, biotechnological equipment biotechnological equipment, 2018-05, Vol.32 (3), p.804-814
Main Authors: Jin, SangHyeon, An, Jinung, Lee, SeungHyun, Lee, Inju, Kim, Hyung Joo
Format: Article
Language:English
Subjects:
Discomfort
Driver fatigue
Evaluation
Fatigue
Hemodynamic responses
Infrared analysis
Infrared spectra
Infrared spectroscopy
long term driving
Lower-back fatigue
Mathematical analysis
Mathematical models
Muscles
Near infrared radiation
NIRS
Noise sensitivity
Oxygen
Polls & surveys
Posture
relative discomfort
Signal processing
Stability analysis
Torso
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Summary:Most research on the relationship between driver fatigue, driving comfort, stability and other factors related to driving has consisted subjective assessments via surveys. Bio-signal measurements allow more objective evaluations but the measurement processes and types are very complicated, and measurement signals are sensitive to noise. To address this issue, this paper attempts to quantify driver fatigue by measuring and analyzing hemodynamic responses with near-infrared spectroscopy. The oxygen concentration changes in the erector spinae muscle were measured for the same subjects when driving a vehicle on a highway for a long time, in one of two driving postures: posture A based on the seat status of the average male body type in South Korea (a 107.7° torso angle, 109.1° chair back angle and 561.0 mm seat x-axis position posture) and Posture B with the chair back angle adjusted by −10° from posture A and the seat moved 4 cm back. A survey was carried out on the degree of lumbar discomfort. The analysis of the degree of relative fatigue, based on driver posture utilizing a mathematical model for the physiological system of lower-back fatigue, showed that posture B is relatively uncomfortable compared to posture A by approximately 41%. The results of analyzing the degree of relative discomfort with regard to driver posture using a mathematical model allow the verification that interpreting the relative degree of discomfort based on the changes in the oxygen concentration at a particular time is possible, and the experimental results show the usefulness of the proposed method.
ISSN:1310-2818
1314-3530
DOI:10.1080/13102818.2018.1446763