Fig. 3.

Measurements during the experimental protocol and correlation analysis for one typical subject. (a) All measured physiological variables throughout the test protocol. PAT is inverted on the Y-axis for illustrative purposes. Darker blue background indicates the isometric exercise period and green background indicates the dynamic exercise period. (b) Scatter plot and Pearson’s correlation coefficients of PAT and BP during the full protocol in the same subject as in (a). (c) Scatter plot and Pearson’s correlation coefficients of PAT and BP during the isometric exercise in the same subject as in (a). (d) Scatter plot and Pearson’s correlation coefficients of PAT and BP during dynamic exercise in the same subject as in (a). HR, heart rate (beats per minute); PAT, pulse arrival time (ms); PP, pulse pressure (mmHg).