Abstract
Background
Accelerometers are widely used to measure sedentary time, physical activity, physical activity energy expenditure (PAEE), and sleep-related behaviors, with the ActiGraph being the most frequently used brand by researchers. However, data collection and processing criteria have evolved in a myriad of ways out of the need to answer unique research questions; as a result there is no consensus.
Objectives
The purpose of this review was to: (1) compile and classify existing studies assessing sedentary time, physical activity, energy expenditure, or sleep using the ActiGraph GT3X/+ through data collection and processing criteria to improve data comparability and (2) review data collection and processing criteria when using GT3X/+ and provide age-specific practical considerations based on the validation/calibration studies identified.
Methods
Two independent researchers conducted the search in PubMed and Web of Science. We included all original studies in which the GT3X/+ was used in laboratory, controlled, or free-living conditions published from 1 January 2010 to the 31 December 2015.
Results
The present systematic review provides key information about the following data collection and processing criteria: placement, sampling frequency, filter, epoch length, non-wear-time, what constitutes a valid day and a valid week, cut-points for sedentary time and physical activity intensity classification, and algorithms to estimate PAEE and sleep-related behaviors. The information is organized by age group, since criteria are usually age-specific.
Conclusion
This review will help researchers and practitioners to make better decisions before (i.e., device placement and sampling frequency) and after (i.e., data processing criteria) data collection using the GT3X/+ accelerometer, in order to obtain more valid and comparable data.
PROSPERO registration number
CRD42016039991.


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Acknowledgements
We are deeply thankful to Patty Freedson, Professor (University of Massachusetts/Amherst, USA) and Catrine Tudor-Locke, PhD (University of Massachusetts/Amherst, USA), for their comments on an earlier draft. This is part of a PhD Thesis conducted in the Biomedicine Doctoral Studies at the University of Granada, Spain.
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This review was conducted under the umbrella of the ActiveBrains project (DEP2013-47540). Jairo H. Migueles is supported by a Grant from the Spanish Ministry of Education, Culture and Sport (FPU15/02645). Cristina Cadenas-Sanchez is supported by a Grant from the Spanish Ministry of Economy and Competitiveness (BES-2014-068829). Jose Mora-Gonzalez is supported by a Grant from the Spanish Ministry of Education, Culture and Sport (FPU14/06837). Francisco B. Ortega and Jonatan R. Ruiz are supported by Grants from the Spanish Ministry of Science and Innovation (RYC-2011-09011 and RYC-2010-05957, respectively). Ulf Ekelund is supported by Grants from the Research Council of Norway (249932/F20) and the UK Medical Research Council (MC_UU_12015/3). Additional funding was obtained from the University of Granada, Plan Propio de Investigación 2016, Excellence actions: Units of Excellence; Unit of Excellence on Exercise and Health (UCEES). In addition, funding was provided by the SAMID III network, RETICS, funded by the PN I + D+I 2017-2021 (Spain), ISCIII- Sub-Directorate General for Research Assessment and Promotion, the European Regional Development Fund (ERDF) (Ref. RD16/0022) and the EXERNET Research Network on Exercise and Health in Special Populations (DEP2005-00046/ACTI).
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Jairo H. Migueles, Cristina Cadenas-Sanchez, Ulf Ekelund, Christine Delisle Nyström, Jose Mora-Gonzalez, Marie Löf, Idoia Labayen, Jonatan R. Ruiz, and Francisco B. Ortega declare that they have no conflicts of interest relevant to the content of this review.
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Migueles, J.H., Cadenas-Sanchez, C., Ekelund, U. et al. Accelerometer Data Collection and Processing Criteria to Assess Physical Activity and Other Outcomes: A Systematic Review and Practical Considerations. Sports Med 47, 1821–1845 (2017). https://doi.org/10.1007/s40279-017-0716-0
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DOI: https://doi.org/10.1007/s40279-017-0716-0
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