Cross-Spectral Analysis of Electrocardiographic and Nostril Airflow Signals Identifies Two Respiratory Frequencies of Heart Rate Modulation

<div>Linear regression analysis between HRV measures and corresponding cross-spectral measures of ECG and nostril airflow in healthy subjects. cs = cross-spectral, nu = normalized unit, and ms = millisecond.</div>

Journal of Healthcare Engineering

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Figure 3: Cross-Spectral Analysis of Electrocardiographic and Nostril Airflow Signals Identifies Two Respiratory Frequencies of Heart Rate Modulation 

Figure 3 | Cross-Spectral Analysis of Electrocardiographic and Nostril Airflow Signals Identifies Two Respiratory Frequencies of Heart Rate Modulation 