Figure 3 | Scientific Reports

Figure 3

From: Resonance frequency is not always stable over time and could be related to the inter-beat interval

Figure 3

Representation of the spectrogram analysis (STFT, 120 s window, 1.5 s resolution, Hann window) of the IBI series (bottom trace) for each breathing rate (7, 6.5, 6, 5.5, 5 b/m) during the HRVB of Participant 15 during the Test session. Hotter color means more respiration energy of the signal and colder less, represented in arbitrary units. During this session, P15 breathed following the metronome with a clear pattern, hotter in 7 b/m (RF). (RR interval: IBI).

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