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Fig. 9 | Journal of Physiological Anthropology

Fig. 9

From: Assessment of autonomic function by long-term heart rate variability: beyond the classical framework of LF and HF measurements

Fig. 9

Trend grams (ad) and power spectra (eh) of R-R interval (RRI), pulse transit time (PTT), pulse interval (PI), and respiration (Resp) obtained by simultaneous recordings of ECG, finger-tip photoplethysmography (PPG), and nose-tip thermistor respiration in a patient with an implanted cardiac pacemaker with a fixed pacing rate (70 bpm). PTT was measured as time from ECG R wave to PPG presystolic foot point of each beat and PI as the interval between the foot points of consecutive pulse waves. PSD, power spectral density. Modified Fig. 1 in reference [84]

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