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Measurement of heart rate variability and stress evaluation by using microwave reflectometric vital signal sensing
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10.1063/1.3478017
/content/aip/journal/rsi/81/9/10.1063/1.3478017
http://aip.metastore.ingenta.com/content/aip/journal/rsi/81/9/10.1063/1.3478017
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) ECG data. (b) HRV signal as a function of time.

Image of FIG. 2.
FIG. 2.

FFT spectrum of the HRV signal.

Image of FIG. 3.
FIG. 3.

Schematic diagram of the microwave reflectometer.

Image of FIG. 4.
FIG. 4.

Flowchart of the stress-evaluation algorithm.

Image of FIG. 5.
FIG. 5.

Experimental setup.

Image of FIG. 6.
FIG. 6.

(a) Comparison between the microwave reflectometer signal and the ECG, (b) selected peak waveforms and a template, and (c) calculated cross-correlation function.

Image of FIG. 7.
FIG. 7.

HRV reconstructed from each signal.

Image of FIG. 8.
FIG. 8.

(a) FFT spectrum of the HRV in relaxed state and (b) FFT spectrum of the HRV in the stressful state.

Image of FIG. 9.
FIG. 9.

(a) Time evolution of the microwave reflectometer signal, (b) the first cross-correlation function, (c) the second cross-correlation function, and (d) the third cross-correlation function.

Image of FIG. 10.
FIG. 10.

FFT spectra of the HRV obtained by the cross-correlation technique and the ECG signal: (a) first, (b) second, and (c) third cross-correlation.

Image of FIG. 11.
FIG. 11.

FFT spectra of the HRV obtained by the MEM technique and the ECG signal.

Image of FIG. 12.
FIG. 12.

Time change rates of the LF/HF.

Image of FIG. 13.
FIG. 13.

Heartbeat signal model.

Image of FIG. 14.
FIG. 14.

Relationship among the heartbeat frequency, the length of data window, and the estimated model order.

Image of FIG. 15.
FIG. 15.

Relationship between the length of data window and the average of the estimated model order.

Image of FIG. 16.
FIG. 16.

Relationship between the length of data window and the average of standardized error rates of LF/HF values.

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/content/aip/journal/rsi/81/9/10.1063/1.3478017
2010-09-13
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Measurement of heart rate variability and stress evaluation by using microwave reflectometric vital signal sensing
http://aip.metastore.ingenta.com/content/aip/journal/rsi/81/9/10.1063/1.3478017
10.1063/1.3478017
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