Wearable Cardioverter–Defibrillator-Measured Step Count for the Surveillance of Physical Fitness during Cardiac Rehabilitation

Figures

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  Figure 1. Median daily step count measured by the WCD at the time of admission and discharge to the CR clinic (Increase from median 5542 (IQR 3718–7055) to median 8778 (IQR 6229–12,920), p < 0.001).

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  Figure 2. Median daily activity level measured by the WCD at the time of admission and discharge to the CR clinic (Increased from a median 117 × 106 (IQR 96 × 106–142 × 106) TVE to 146 × 106 (110 × 106–169 × 106), p < 0.001).

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  Figure 3. Median daily heart rate measured by the WCD at the time of admission and discharge to the CR clinic (Decreased from a median 74.9 bpm (IQR 65.8–84.5) to 70.2 (IQR 64.1–77.3), p = 0.09).

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  Figure 4. Scatterplot of 6MWT and step count at admission and discharge with respective correlation coefficients. The relationship between the 6MWT and the step count at admission (blue) and discharge (orange) of the CR stay are illustrated. The graph visualizes their respective correlation coefficients. Blue dots represent patients at admission, whereas orange dots represent patients at discharge. The lines depict the correlation coefficient between the 6MWT and the step count at admission in blue and at discharge in orange. The rectangles represent the mean confidence intervals of the respective means (r = 0.32, p = 0.04 and 0.37, p = 0.02, respectively).

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  Figure 5. Scatterplot of 6MWT and activity level at admission and discharge with respective correlation coefficients. The relationship between the 6MWT and the activity level at admission (blue) and discharge (orange) of the CR stay are illustrated. The graph visualizes their respective correlation coefficients. Blue dots represent patients at admission, whereas orange dots represent patients at discharge. The lines depict the correlation coefficient between the 6MWT and the activity level at admission in blue and at discharge in orange. The rectangles represent the mean confidence intervals of the respective means (r = 0.02, p = 0.90 and r = 0.15, p = 0.35, respectively).

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  Figure 6. Scatterplot of 6MWT and heart rate at admission and discharge with respective correlation coefficients. The relationship between the 6MWT and the heart rate at admission (blue) and discharge (orange) of the CR stay are illustrated. The graph visualizes their respective correlation coefficients. Blue dots represent patients at admission, whereas orange dots represent patients at discharge. The lines depict the correlation coefficient between the 6MWT and the heart rate at admission in blue and at discharge in orange. The rectangles represent the mean confidence intervals of the respective means (r = −0.33, p = 0.03 and r = −0.13, p = 0.41, respectively).