The effects of physical vibration on heart rate variability as a measure of drowsiness

Zhang, N, FARD, M, Bhuiyan, M, Verhagen, D, Azari, M and Robinson, S 2018, 'The effects of physical vibration on heart rate variability as a measure of drowsiness', Ergonomics, vol. 61, no. 9, pp. 1259-1272.


Document type: Journal Article
Collection: Journal Articles

Title The effects of physical vibration on heart rate variability as a measure of drowsiness
Author(s) Zhang, N
FARD, M
Bhuiyan, M
Verhagen, D
Azari, M
Robinson, S
Year 2018
Journal name Ergonomics
Volume number 61
Issue number 9
Start page 1259
End page 1272
Total pages 14
Publisher Taylor and Francis
Abstract We investigated the effects of low frequency whole body vibration on heart rate variability (HRV), a measure of autonomic nervous system activation that differentiates between stress and drowsiness. Fifteen participants underwent two simulated driving tasks for 60min each: one involved whole-body 4-7Hz vibration delivered through the car seat, and one involved no vibration. The Karolinska Sleepiness Scale (KSS), a subjective measure of drowsiness, demonstrated a significant increase in drowsiness during the task. Within 15-30min of exposure to vibration, autonomic (sympathetic) activity increased (p<.01) in response to the stress of maintaining alertness and performance when drowsy, and peaked at 60min (p<.001). Changes in three other HRV domains [higher LF/HF ratios, lower RMSSD (ms) and pNN50 (%) values] were consistent with increased sympathetic activation. These findings have implications for the future development of equivalent drowsiness contours leading to improvements in road safety.Practitioner summary: The effects of physical vibration on driver drowsiness have not been well investigated. This laboratory-controlled study found characteristic changes in heart rate variability (HRV) domains that indicated progressively increasing neurological effort in maintaining alertness in response to low frequency vibration, which becomes significant within 30min.Abbreviations: ANS: autonomic nervous system; Ctrl: control; EEG: electroencephalography; HF: the power in high frequency range (0.15 Hz-0.4Hz) in the PSD relected parasympathetic activity only; HRV: heart rate variability; KSS: karolinska sleepiness scale; LF: the power in low frequency range (0.04 Hz-0.15Hz) in the PSD reflected both sympathetic and parasympathetic activity of the autonomic nervous system; LF/HF ratio: the ratio of LF to HF indicated the balance between sympathetic and parasympathetic activity; RMSSD: the root mean square of difference of adjacent RR interval; pNN50: the number of successive
Subject Automotive Safety Engineering
Keyword(s) Attention
drowsiness
mental workload
autonomic nervous system (ans)
vibration
driving
DOI - identifier 10.1080/00140139.2018.1482373
Copyright notice © 2018 Informa UK Limited, trading as Taylor and Francis Group
ISSN 1366-5847
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