Blood pressure altering method affects correlation with pulse arrival time

Figures

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  Fig. 1. Illustration of the test protocol with isometric exercise, dynamic exercise and rest periods. The dynamic exercise consisted of four 4-minute increments with increasing workload from the first through the third and a fourth recovery increment.

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  Fig. 2. Group average change from baseline in measured physiological variables during the two exercise modalities. Values are presented as mean ± SD. HR, heart rate (bpm); PAT, pulse arrival time (ms); PP, pulse pressure (mmHg).

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  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).

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  Fig. 4. Mean ± SD of individual Pearson’s correlation coefficients between PAT/SBP, PAT/DBP and PAT/PP. Analyses were performed for the full protocol and then separately for the isometric exercise period and dynamic exercise period. PAT, pulse arrival time (ms); PP, pulse pressure (mmHg).

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  Fig. 5. Mean ± SD of the individual regression coefficients between PAT as the dependent variable and SBP and DBP as the independent variable. The analysis was performed for the full protocol and then separately for the isometric exercise period and dynamic exercise period. The presented numerical data in the graph represents change in PAT per one-unit change in BP (ms/mmHg). PAT, pulse arrival time (ms).