Number of days required to estimate physical activity constructs objectively measured in different age groups: Findings from three Brazilian (Pelotas) population-based birth cohorts

Autoři: Luiza Isnardi Cardoso Ricardo aff001;  Andrea Wendt aff001;  Leony Morgana Galliano aff002;  Werner de Andrade Muller aff002;  Gloria Izabel Niño Cruz aff001;  Fernando Wehrmeister aff001;  Soren Brage aff003;  Ulf Ekelund aff004;  Inácio Crochemore M. Silva aff001
Působiště autorů: Postgraduate Program in Epidemiology, Federal University of Pelotas, Pelotas, Brazil aff001;  Postgraduate Program in Physical Education, Federal University of Pelotas, Pelotas, Brazil aff002;  MRC Epidemiology Unit, University of Cambridge, Cambridge, England, United Kingdom aff003;  Department of Sport Medicine, Norwegian School of Sport Sciences, Oslo, Norway aff004
Vyšlo v časopise: PLoS ONE 15(1)
Kategorie: Research Article
doi: 10.1371/journal.pone.0216017



The present study aims to estimate the minimum number of accelerometer measurement days needed to estimate habitual physical activity (PA) among 6- (2010), 18- (2011) and 30- (2012) year-old participants, belonging to three population-based Brazilian birth cohorts.


PA was assessed by triaxial wrist-worn GENEActiv accelerometers and the present analysis is restricted to participants with at least 6 consecutive days of measurement. Accelerometer raw data were analyzed with R-package GGIR. Description of PA measures (overall PA, moderate-to-vigorous PA (MVPA), light PA (LPA)) on weekdays and weekend days were conducted, and statistical differences were tested with chi-squared and Kruskal-Wallis tests. Spearman Brown Formulae was applied to test reliability of different number of days of accelerometer use.


Differences between week and weekend days regarding LPA, MVPA and overall PA, were only observed among 30-year-olds. Higher levels of MVPA (p = 0.006) and overall PA (p<0.001) were identified on weekdays. For overall PA, to achieve a reliability coefficient >0.70, two and three days of measurement were needed in adults and children, respectively. For LPA, a reliability coefficient >0.70 was achieved with five days in 6-year-old children, three days in 18-year-old young adults, and four days in 30-year-old adults. Considering MVPA, four days would be necessary to represent a week of measurement among all cohort groups.


Our results show that four and five measurement days are needed to estimate all habitual PA constructs, for children and adults, respectively. Also, among 30-year-old adults, it is important to make efforts towards weekend days measurement.

Klíčová slova:

Accelerometers – Age groups – Brazil – Cohort studies – Exercise – Physical activity – Research validity – Young adults


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2020 Číslo 1