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

were fitted to a mask attached to a portable metabolic measurement device (Oxycon Mobile, Carefusion, Yorba Linda, CA, USA) placed in a backpack, and an Actigraph GT3X+ device was placed on the left hip. One study reported no difference in hip placement or activity counts for walking/running activities

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Kenneth E. Powell and Steven N. Blair

risk-factor status of individuals meeting the commonly recommended volume of MVPA primarily with bouts ≥10 min in duration with that of individuals with comparable MVPA activity counts accumulated primarily with bouts <10 min in duration. Of 40 comparisons in these 14 studies, 78% (31) indicated that

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Liina Remmel, Vallo Tillmann, Eva Mengel, Pille Kool, Priit Purge, Evelin Lätt and Jaak Jürimäe

from 0.05 to 2.00 GS with a frequency response of 0.25–2.50 Hz. All participants wore the accelerometer on the right hip for 7 consecutive days during the wake-up time. The accelerometer data were analyzed using the activity counts of 15-second epochs ( 15 ). For the analyses of accelerometer data, all

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Kerry E. Costello, Janie L. Astephen Wilson and Cheryl L. Hubley-Kozey

90 minutes of zero activity counts with a 2-minute non-zero spike tolerance ( Choi, Liu, Matthews, & Buchowski, 2011 ), based on recommendations for individuals with OA ( Song et al., 2010 ). To ensure validity, this wear time validation was also compared with written logs. For two individuals (three

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Tiago V. Barreira, Stephanie T. Broyles, Catrine Tudor-Locke, Jean-Philippe Chaput, Mikael Fogelholm, Gang Hu, Rebecca Kuriyan, Estelle V. Lambert, Carol A. Maher, José A. Maia, Timothy Olds, Vincent Onywera, Olga L. Sarmiento, Martyn Standage, Mark S. Tremblay, Peter T. Katzmarzyk and for the ISCOLE Research Group

episode time distinct from waking nonwear time, and this was done using a 60-second epoch and published automated algorithms. 18 , 19 After exclusion of the nocturnal sleep episode time, nonwear time was determined as any sequence of at least 20 consecutive minutes of zero activity counts. 20 Once

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Laura D. Ellingson, Paul R. Hibbing, Gregory J. Welk, Dana Dailey, Barbara A. Rakel, Leslie J. Crofford, Kathleen A. Sluka and Laura A. Frey-Law

locations (e.g., hip vs. wrist), and data formats (e.g., raw vs. activity counts) ( Ellingson, Schwabacher, Kim, Welk, & Cook, 2016 ; Hibbing, Kim, Saint-Maurice, & Welk, 2016 ; Hildebrand, VAN Hees, Hansen, & Ekelund, 2014 ; Kim & Welk, 2015 ; Migueles et al., 2017 ). Previous work from our research

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Barbara Resnick, Elizabeth Galik, Marie Boltz, Erin Vigne, Sarah Holmes, Steven Fix and Shijun Zhu

). Prior evidence of reliability of the MotionWatch 8 was based on the consistency between recordings across 3 days of wear. Evidence of validity of the MotionWatch 8 was based on a consistent match between the activity counts and recorded activity performed and a statistically significant difference in

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Peng Zhang, Jung Eun Lee, David F. Stodden and Zan Gao

were set at 15-second intervals. Raw activity counts were interpreted using empirically established cut points that defined different PA intensity: sedentary (<100 count/min), LPA (101–2295 count/min), and MVPA (>2296 count/min). 22 Data were collected in September/October of 2012 (baseline assessment

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Brian M. Wood, Herman Pontzer, Jacob A. Harris, Audax Z.P. Mabulla, Marc Hamilton, Ted Zderic, Bret A. Beheim and David A. Raichlen

). Free-living activity counts-derived breaks in sedentary time: Are they real transitions from sitting to standing? Gait & Posture, 42, 70 – 72 . doi: 10.1016/j.gaitpost.2015.04.008 Blurton Jones , N. ( 2016 ). Demography and evolutionary ecology of Hadza hunter-gatherers .  Cambridge, United

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Elroy J. Aguiar, John M. Schuna Jr., Tiago V. Barreira, Emily F. Mire, Stephanie T. Broyles, Peter T. Katzmarzyk, William D. Johnson and Catrine Tudor-Locke

monitored hours per day, with nonwear time defined as ≥60 min of consecutive zero-activity counts per minute, allowing for minimal interruptions (up to 2 min of counts between 0 and 100; Troiano et al., 2008 ). All individuals with at least one valid day of data were retained in the analysis ( Tudor