Key result
Self-reported activity and sedentary time show modest correlation and only ~30% congruency with accelerometers post-MI.
Why the study?
Guidelines recommend regular physical activity and decreased sedentary time after myocardial infarction, making valid self-assessment vital in clinical practice.
Are commonly used self-assessment questions for physical activity and sedentary time valid compared to accelerometers in patients after myocardial infarction?
Cross-Sectional (n=123)
No
Are commonly used self-assessment questions for physical activity and sedentary time valid compared to accelerometers in patients after myocardial infarction?
Effect estimate: r = 0.37
Commonly used physical activity and sedentary time questions have high misclassification rates compared to accelerometers in post-MI patients, though they may still be useful for initiating clinical dialogue.
Self-reports risk substantial misclassification of activity in post-MI patients; leaves open the need for objective measures in clinical assessment and trials.
BACKGROUND: Guidelines recommend regular physical activity (PA) and decreased sedentary time (SED) for patients after myocardial infarction (MI). Therefore, valid self-assessment of PA is vital in clinical practice. The purpose of this study was to assess the convergent validity of commonly used PA and SED questions recommended by the National Board of Health and welfare (NBHW) and national SWEDEHEART-registry using accelerometers as the reference method in patients after MI. METHODS: Data were obtained 2017-2021 among Swedish men and women (180 assessments). Participants answered five commonly used PA and SED-questions (by NBHW and SWEDEHEART) and wore an accelerometer (Actigraph GT3X) for seven days. Convergent validity was assessed gradually by; Kruskall Wallis-, Sperman rho, Weighted Kappa- and ROC-analyses. Misclassification was explored by Chi-square analyses with Benjamini-Hochberg adjustment. RESULTS: The strongest correlation (r = 0.37) was found for the SED-GIH question (NBHW). For PA, no specific question stood out, with correlations of r = 0.31 (NBWH), and r = 0.24-0.30 (SWEDEHEART). For all questions (NBHW and SWEDEHEART), there was a high degree of misclassification (congruency 12-30%) affecting the agreement (0.09-0.32) between self-report and accelerometer assessed time. The SED-GIH, PA-index and SWEDEHEART-VPA had the strongest sensitivity for identifying individuals with high SED (0.72) or low PA (0.77 and 0.75). CONCLUSION: The studied PA and SED questions may provide an indication of PA and SED level among patients with MI in clinical practice and could be used to form a basis for further dialogue and assessment. Further development is needed, since practical assessment tools of PA and SED are desirable.
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Lönn et al. (2022) conducted a cross-sectional in Myocardial infarction (n=123). Self-reported physical activity and sedentary time questionnaires vs. Accelerometer assessment was evaluated on Convergent validity (correlation) of the SED-GIH sedentary time question with accelerometer data (r = 0.37). Self-reported physical activity and sedentary time questionnaires showed modest to moderate correlation (r=0.24-0.37) and a high degree of misclassification (12-30% congruency) compared to accelerometer data in patients after myocardial infarction.
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