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The effect of a video‐supported assessment to increase the accuracy of self‐reported physical activity
Author(s) -
Ullrich Antje,
Voigt Lisa,
SiewertMarkus Ulrike,
Meyer Christian,
Dörr Marcus,
Ulbricht Sabina
Publication year - 2021
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/sms.13916
Subject(s) - percentile , wilcoxon signed rank test , medicine , physical activity , physical therapy , accelerometer , mann–whitney u test , statistics , mathematics , computer science , operating system
Self‐reported physical activity differs from activity levels measured by device. We tested the effect of a video that visualizes the intensity levels of physical activity to increase the agreement between self‐reported and accelerometer‐based moderate‐to‐vigorous physical activity (MVPA) within a single‐blinded, randomized study. Participants (N = 378, 40‐75 years) wore an accelerometer for seven days. Prior to the collection of self‐reported data by the IPAQ‐SF, participants were randomly assigned (1:1) to a control group (CG) or a video group (VG). The outcome was the absolute difference between self‐reported and accelerometer‐based time spent in MVPA ( Δ MVPA IPAQ−Accelerometry ). To examine the agreement, we used Spearman correlation coefficients and Bland‐Altman analysis. To test the video effect, we used Wilcoxon signed‐rank test, Bayes factor, and simultaneous‐quantile regression. In total, 302 participants fulfilled the accelerometer wear time criteria (≥10 hours/day; ≥6 days) and completed self‐reports within three days after the wearing period. The median of Δ MVPA IPAQ−Accelerometry was −9.0 min/day ( IQR : −32.0 to 66.6) for CG and −11.5 min/day ( IQR : −29.9 to 14.3) for VG. Wilcoxon signed‐rank test revealed no differences in Δ MVPA IPAQ−Accelerometry between study groups whereas Bayes factor indicated insensitivity of the data. Simultaneous‐quantile regression revealed no relationship between video presentation and Δ MVPA IPAQ−Accelerometry in the 25th percentile. In the 50th ( b = −12.4 [ 95% CI = −23.2 to −1.5] and 75th percentile ( b = −45.7 [ 95% CI = −70.5 to −20.9]), Δ MVPA IPAQ−Accelerometry was negatively associated with video presentation. To conclude, video‐supported assessment may increase the accuracy of self‐reported MVPA among individuals who slightly underestimated and those who overestimated their MVPA.