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Figure 3 | BMC Physiology

Figure 3

From: Fine structure of the low-frequency spectra of heart rate and blood pressure

Figure 3

Spectral analysis of the systolic blood pressure. An example of the AR spectral density of the systolic blood pressure (SAP) as a function of time and frequency (left panel) and the spectral decomposition corresponding to the poles of the spectral density function (right panel). The blood pressure was measured on the same subject as in the Fig. 1. The spectral details are very similar to those of the RRI spectrum.

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