A novel autonomic activation measurement method for stress monitoring: non-contact measurement of heart rate variability using a compact microwave radar

Medical & Biological Engineering & Computing
S SuzukiMitsuyuki Kawakami

Abstract

We developed a novel method for non-contact monitoring of stress-induced autonomic activation through the back of a chair, using a compact 24 GHz microwave radar (8 x 5 x 3 cm), without large-scale equipment and placing a heavy burden on the monitored individual. Following a silent period of 120 s, audio stimuli using a composite tone of 2,120 and 2,130 Hz sine-waves at 95 dB were conducted for 120 s. From dorsal, LF/HF of HRV reflecting sympatho-vagal balance was determined by microwave radar with the maximum entropy method using eight volunteers (mean age 23 +/- 1 years). Mean LF/HF measured by non-contact and contact (using electrocardiography for reference) methods during audio stimuli increased 34 and 37%, respectively, as compared with those of the silent period. Maximum cross-correlations between contact and non-contact measurements averaged 0.73 +/- 0.10. Our method appears to be promising for future monitoring of stress-induced autonomic activation of operators and may reduce stress-induced accidents.

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Citations

Oct 24, 2008·Medical & Biological Engineering & Computing·Satoshi SuzukiMasayuki Ishihara
Jul 7, 2009·Medical & Biological Engineering & Computing·Shinji GotohTakemi Matsui
Dec 27, 2011·Journal of Physiological Anthropology·Satoshi SuzukiKentaro Kotani
Feb 4, 2014·Computational and Mathematical Methods in Medicine·Wan-Hua LinYuan-Ting Zhang
Nov 26, 2015·Medical Engineering & Physics·Norihiro SugitaYukio Ohtaki
May 23, 2014·Frontiers in Physiology·James A J Heathers
Aug 8, 2018·Medical & Biological Engineering & Computing·Prabal Verma, Sandeep K Sood
Jun 2, 2018·Computational and Mathematical Methods in Medicine·Linfei GeJing Wei
Nov 27, 2019·Scientific Reports·Naoki HagiyamaToshio Tsuji

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