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Article

Influence of the Duration and Timing of Data Collection on Accelerometer-Measured Physical Activity, Sedentary Time and Associated Insulin Resistance

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Turku PET Centre, University of Turku and Turku University Hospital, 20521 Turku, Finland
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The UKK-Institute for Health Promotion Research, Kaupinpuistonkatu 1, 33500 Tampere, Finland
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Department of Biostatistics, University of Turku, 20014 Turku, Finland
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Faculty of Medicine and Health Technology, Tampere University, 33720 Tampere, Finland
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Rydberg Laboratory of Applied Sciences, University of Halmstad, 30118 Halmstad, Sweden
*
Author to whom correspondence should be addressed.
Academic Editor: Scott Duncan
Int. J. Environ. Res. Public Health 2021, 18(9), 4950; https://doi.org/10.3390/ijerph18094950
Received: 29 March 2021 / Revised: 28 April 2021 / Accepted: 5 May 2021 / Published: 6 May 2021
Accelerometry is a commonly used method to determine physical activity in clinical studies, but the duration and timing of measurement have seldom been addressed. We aimed to evaluate possible changes in the measured outcomes and associations with insulin resistance during four weeks of accelerometry data collection. This study included 143 participants (median age of 59 (IQR9) years; mean BMI of 30.7 (SD4) kg/m2; 41 men). Sedentary and standing time, breaks in sedentary time, and different intensities of physical activity were measured with hip-worn accelerometers. Differences in the accelerometer-based results between weeks 1, 2, 3 and 4 were analyzed by mixed models, differences during winter and summer by two-way ANOVA, and the associations between insulin resistance and cumulative means of accelerometer results during weeks 1 to 4 by linear models. Mean accelerometry duration was 24 (SD3) days. Sedentary time decreased after three weeks of measurement. More physical activity was measured during summer compared to winter. The associations between insulin resistance and sedentary behavior and light physical activity were non-significant after the first week of measurement, but the associations turned significant in two to three weeks. If the purpose of data collection is to reveal associations between accelerometer-measured outcomes and tenuous health outcomes, such as insulin sensitivity, data collection for at least three weeks may be needed. View Full-Text
Keywords: sedentary behavior; insulin sensitivity; accelerometry; measurement accuracy; measurement error; data variability sedentary behavior; insulin sensitivity; accelerometry; measurement accuracy; measurement error; data variability
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MDPI and ACS Style

Sjöros, T.; Vähä-Ypyä, H.; Laine, S.; Garthwaite, T.; Löyttyniemi, E.; Sievänen, H.; Kalliokoski, K.K.; Knuuti, J.; Vasankari, T.; Heinonen, I.H.A. Influence of the Duration and Timing of Data Collection on Accelerometer-Measured Physical Activity, Sedentary Time and Associated Insulin Resistance. Int. J. Environ. Res. Public Health 2021, 18, 4950. https://doi.org/10.3390/ijerph18094950

AMA Style

Sjöros T, Vähä-Ypyä H, Laine S, Garthwaite T, Löyttyniemi E, Sievänen H, Kalliokoski KK, Knuuti J, Vasankari T, Heinonen IHA. Influence of the Duration and Timing of Data Collection on Accelerometer-Measured Physical Activity, Sedentary Time and Associated Insulin Resistance. International Journal of Environmental Research and Public Health. 2021; 18(9):4950. https://doi.org/10.3390/ijerph18094950

Chicago/Turabian Style

Sjöros, Tanja, Henri Vähä-Ypyä, Saara Laine, Taru Garthwaite, Eliisa Löyttyniemi, Harri Sievänen, Kari K. Kalliokoski, Juhani Knuuti, Tommi Vasankari, and Ilkka H.A. Heinonen. 2021. "Influence of the Duration and Timing of Data Collection on Accelerometer-Measured Physical Activity, Sedentary Time and Associated Insulin Resistance" International Journal of Environmental Research and Public Health 18, no. 9: 4950. https://doi.org/10.3390/ijerph18094950

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