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Lyndel Hewitt, Anthony D. Okely, Rebecca M. Stanley, Marjika Batterham, and Dylan P. Cliff

objectively measure tummy time and its relationship with health and development outcomes. 7 The process of objective tummy time measurement was initiated through developing an algorithm to analyze GENEActiv triaxial accelerometer data (ActivInsights Ltd, Cambridgeshire, UK). This algorithm was able to

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Marcin Straczkiewicz, Jacek Urbanek, and Jaroslaw Harezlak

developed GUI and no advanced computational skills are required to explore the data. Moreover, modular architecture of RADVis allows for further expansion of its functionality by the user. In the current version, RADVis allows investigation of the data collected by the GENEActiv (Activinsights Ltd

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Alex V. Rowlands, Tatiana Plekhanova, Tom Yates, Evgeny M. Mirkes, Melanie Davies, Kamlesh Khunti, and Charlotte L. Edwardson

, Keane, Harrington, & Fitzgerald, 2017 ); and British Whitehall II Study ( Menai et al., 2017 ), ≅3750 participants. Of these, the Axivity was used in UK Biobank and the Breakthrough Generation Study, the ActiGraph in NHANES, and the GENEActiv in the remaining surveys. All surveys deployed monitors on

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Emma L. J. Eyre, Jason Tallis, Susie Wilson, Lee Wilde, Liam Akhurst, Rildo Wanderleys, and Michael J. Duncan

ActiGraph monitors, suggesting it provides a valid and accurate estimate of physical activity intensities ( John, Tylo & Basset, 2010 ; Plasqui & Westerterp, 2007 ). A newer tool, the GENEActiv, has demonstrated excellent reliability and validity against breath-by-breath VO 2 , derived from indirect

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Tatiana Plekhanova, Alex V. Rowlands, Tom Yates, Andrew Hall, Emer M. Brady, Melanie Davies, Kamlesh Khunti, and Charlotte L. Edwardson

; however, the three most widely used research-grade raw data accelerometer brands deployed in epidemiological studies are the Axivity (Axivity Ltd., Newcastle, United Kingdom), ActiGraph (ActiGraph LLC, Pensacola, FL), and GENEActiv (ActivInsights Ltd., Cambridgeshire, United Kingdom). Various

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Sarah G. Sanders, Elizabeth Yakes Jimenez, Natalie H. Cole, Alena Kuhlemeier, Grace L. McCauley, M. Lee Van Horn, and Alberta S. Kong

the GENEActiv wrist-worn accelerometer (GA) were first published for youth in 2013. 7 Studies reporting MVPA measured at the wrist in adolescents are limited and vary in location (United Kingdom, United States, and Spain); in the type of accelerometer used; and in how the data were processed and

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Erin Strutz, Raymond Browning, Stephanie Smith, Barbara Lohse, and Leslie Cunningham-Sabo

, and duration of PA. 17 The GENEActiv ACC (Activinsights Ltd, Cambridge, UK) is one such device that collects raw (ie, not processed) acceleration data and allows for a user-determined sampling frequency ranging from 10 to 100 Hz. This waterproof, wrist-mounted device has been validated for use in

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Alberto Flórez-Pregonero, Matthew S. Buman, and Barbara E. Ainsworth

wearing monitors is improved by wearing a monitor on the wrist as opposed to other parts of the body ( Freedson, & John, 2013 ). The ActiGraph and the GENEActiv are monitors that can be worn on the wrist. The wrist-worn ActiGraph ( Koster et al., 2016 ) and GENEActiv ( Pavey, Gomersall, Clark, & Brown

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Gráinne Hayes, Kieran Dowd, Ciaran MacDonncha, and Alan Donnely

monitors in adolescent research (activPAL3 micro, activPAL, ActiGraph wGT3X-BT, ActiGraph GT1M, and GENEActiv) using VO 2 determined from a potable metabolic unit as the criterion. The thresholds developed for each of the included monitors will enable researchers to reprocess and compare data that was

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Jennifer L. Huberty, Jeni L. Matthews, Meynard Toledo, Lindsay Smith, Catherine L. Jarrett, Benjamin Duncan, and Matthew P. Buman

, LLC 2013) is a portable device that measures body acceleration in the antero-posterior, the medio-lateral, and vertical planes of movement, and can also be worn around any part of the body, allowing research subjects to move freely ( Sasaki, John, & Freedson, 2011 ). Similarly, the GENEActiv is a