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Figure 1 | BMC Physiology

Figure 1

From: Heart rate variability in conscious neonatal swine: spectral features and responses to short-term intermittent hypoxia

Figure 1

Left panel shows digital traces of ventilation (VENT), abdominal aortic blood pressure (AoP), and Lead II electrocardiogram (ECG) signals representing activity during baseline condition. Downward pointing arrow indicates inspiration. Right panel illustrates VENT spectrum along with the blood pressure variability (BPV) and heart rate variability (HRV) spectra (bin widths = 0.005 Hz). These spectra were computed from 150 s of continuous data that was free of arrhythmias and movement artifacts. The dashed lines in the HRV spectrum encompass the frequency boundaries for low frequency activity, i.e., 0.05 – 0.15 Hz. Note that AoP and HRV spectra exhibited ventilatory related activity that greatly exceeded the magnitudes of low frequency activity.

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BMC Physiology

ISSN: 1472-6793

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