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. Author manuscript; available in PMC: 2023 Jan 1.
Published in final edited form as: IEEE Trans Biomed Eng. 2021 Dec 23;69(1):53–62. doi: 10.1109/TBME.2021.3087105

Fig. 1.

Fig. 1.

The peak-to-peak amplitude of the photoplethysmography (PPG) waveform does not track intervention-induced blood pressure (BP) changes [3]. SB is slow breathing; MA, mental arithmetic; CP, cold pressor; and NTG, nitroglycerin. Bars are mean±SE.