![]() ![]() 6 Social desirability or the motivation to be physically more active than usual due to wearing such a device might be reasons for the presence of accelerometer measurement reactivity (AMR). 5 Participants can influence data measurement by changing their behavior when they are aware of wearing an accelerometer. Accelerometer-based measures might be subject to human-related sources of bias. 4Īccelerometry is frequently used to assess SB and PA. 3, 4 This behavioral variability needs to be carefully studied because it has major implications for the measurement and conclusions drawn from data analysis. 2 Day-to-day variability around a mean level is a natural part of SB and PA and is described as the habitual level of the SB and PA of an individual. 1 This is challenging because both behaviors are characterized by considerable interindividual and intraindividual variability. In order to determine the level of sedentary behavior (SB) and physical activity (PA), to understand their relationship with health, and to evaluate the efficacy of behavioral interventions, an accurate measure of SB and PA is required. Although 7-day accelerometry seems to be a reproducible measure, our findings highlight accelerometer wear time as a crucial confounder in analyzing SB and PA data. Conclusions: AMR may influence SB and PA estimates differentially. The AMR was not identified as a source of bias in any regression model. The participants reduced their wear time ( b = −5.2 min/d) only at the baseline. Results: Within each 7-day accelerometry assessment, the participants increased their time spent in SB ( b = 2.4 min/d b = 3.8 min/d) and reduced their time spent in light PA ( b = −2.0 min/d b = −3.2 min/d), but did not change moderate to vigorous PA. Intraclass correlations were calculated to examine the reproducibility using 2-level mixed-effects linear regression analyses. Latent growth models were used to identify AMR. Methods: In total, 136 participants (65% women, mean age = 54.6 y) received 7-day accelerometry at the baseline and after 12 months. Background: The purposes of this study were to examine accelerometer measurement reactivity (AMR) in sedentary behavior (SB), physical activity (PA), and accelerometer wear time in 2 measurement periods and to quantify AMR as a human-related source of bias for the reproducibility of SB and PA estimates. ![]()
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