Differential Agreement of Self-Reported Sedentary Behavior and Physical Activity With Accelerometer Measures in Adults With Congenital Heart Disease

Figures

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  Central Figure.

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  Figure 1.. Activity profiles based on accelerometer-derived sedentary time and moderate-to-vigorous physical activity. Scatter plot showing individual participants according to daily sedentary behavior (SB, min/day) and moderate-to-vigorous physical activity (MVPA, min/day) measured by accelerometry (n=177). Dashed vertical and horizontal lines indicate the cohort-specific median values of MVPA (45.0 min/day) and sedentary behavior (SB; 568.7 min/day), respectively, which were used to define 4 activity profiles: active, active but sedentary, low MVPA and low SB, and sedentary–inactive.

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  Figure 2.. Distribution of accelerometer-derived activity composition across activity profiles. Box plots show the proportion of accelerometer wear time spent in sedentary behavior (%SB, A), light physical activity (%LPA, B), and moderate-to-vigorous physical activity (%MVPA, C) across the 4 activity profiles. Boxes indicate the interquartile range, the horizontal line indicates the median, and whiskers indicate 1.5-fold the interquartile range. Activity profiles were defined based on cohort-specific median values of sedentary time and MVPA time derived from accelerometry.

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  Figure 3.. Receiver operating characteristic curve for sedentary time (A) and moderate-to-vigorous physical activity time (B) derived from the International Physical Activity Questionnaire (IPAQ) in identifying a sedentary–inactive activity profile defined by accelerometry. (A) IPAQ-derived sedentary time demonstrates good discriminatory ability (AUC 0.811, 95% CI 0.744–0.879). The optimal cutoff value was 405 min/day, yielding a sensitivity of 84.2% and a specificity of 69.0% (n=177). The diagonal line indicates the reference line (AUC=0.5). (B) IPAQ-derived MVPA shows modest discriminatory ability (AUC 0.663, 95% CI 0.583–0.744; n=177). No clinically meaningful cutoff could be identified due to a marked floor effect, with a substantial proportion of participants reporting 0 min/week of MVPA. AUC, area under the curve; CI, confidence interval.