Does Doppler radar cardiopulmonary remote sensing accurately measure heart rate variability and respiratory sinus arrhythmia compared to ECG in human subjects?
Doppler radar cardiopulmonary remote sensing provides accurate extraction of HRV and RSA indices comparable to standard ECG and chest belt references.
An investigation of heart rate variability (HRV) and respiratory sinus arrhythmia (RSA) indices using data obtained from Doppler radar cardiopulmonary remote sensing is presented in this paper. High accuracy in extracting the HRV and RSA indices was achieved using a direct-conversion quadrature radar system with linear demodulation method. This method was validated using data obtained from 12 human subjects in seated and supine positions. For supine position measurements, all standard deviation of normal beat-to-beat interval indices from Doppler radar and electrocardiogram reference differed less than 9 ms of each other, while all the root mean square of differences of successive normal beat-to-beat interval indices differed less than 76 ms. The measurements from subjects in seated and supine positions with normal RSA demonstrated that the results from radar correlated well with both respiratory piezoresistor chest belts. Higher level of HRV and RSA was detected in seated position, as expected.
Massagram et al. (Wed,) studied this question.
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