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Molly P. O’Sullivan, Matthew R. Nagy, Shannon S. Block, Trevor R. Tooley, Leah E. Robinson, Natalie Colabianchi and Rebecca E. Hasson

of ≥60 minutes of zero activity counts were also defined as nonwear time, allowing for 1–2 minutes of counts between 0 and 100 ( 20 ). Nonwear times were excluded from the analyses. The Evenson ( 5 ) cut points were used to derive activity intensities (sedentary: 0–100 counts per minute; low

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Mallory S. Kobak, Andrew Lepp, Michael J. Rebold, Hannah Faulkner, Shannon Martin and Jacob E. Barkley

a significant main effect of condition for accelerometer counts ( F  = 5.3, P  = .03; Figure  1 ). Children accumulated significantly greater total physical activity counts per METs when playing without the iPad present [101,733 (60,015) counts, 5.3 (4.0) METs/min or moderate intensity] versus

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Daniel Arvidsson, Elias Johannesson, Lars Bo Andersen, Magnus Karlsson, Per Wollmer, Ola Thorsson and Magnus Dencker

). This is a uniaxial accelerometer recording acceleration signals along the vertical axis to generate activity counts corresponding to activity intensity. 19 Recordings of physical activity in the present study were performed during the whole autumn school term. Children were instructed to wear the

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Sandra Silva-Santos, Amanda Santos, Michael Duncan, Susana Vale and Jorge Mota

of GMC was subsequently converted to z scores. MVPA and Sedentary Behavior MVPA and sedentary behavior were measured during seven consecutive days (Monday to Sunday using the ActiGraph GT1M accelerometer; Pensacola, FL, USA). This accelerometer provides output in activity counts, which offers

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Deirdre Dlugonski, Katrina Drowatzky DuBose and Patrick Rider

71% (n = 12) of mothers had ≥6 valid days. Mothers accumulated 188,844 (47,966) vertical axis activity counts and walked 5504 (1274) steps per day. Mothers engaged in 284.0 (73.0) minutes of light-intensity activity, 16.5 (10.0) minutes of MVPA, and 520 (62) minutes of sedentary time per day

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Kent A. Lorenz, Hans van der Mars, Pamela Hodges Kulinna, Barbara E. Ainsworth and Melbourne F. Hovell

measure the behavioral variables while simultaneously recording PA. 22 Table 2 Interobserver Correlation Coefficients and R 2 Values for Physical Activity Counts Girls Boys Intensity r R 2 r R 2 Sedentary .9973 a .99 .9932 a .99 Moderate .9080 a .82 .9053 a .82 Vigorous .8157 a .66 .8841 a .78 a

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Heidi J. Syväoja, Anna Kankaanpää, Jouni Kallio, Harto Hakonen, Janne Kulmala, Charles H. Hillman, Anu-Katriina Pesonen and Tuija H. Tammelin

requiring balance and agility as well as social aspects of PA, which typically do not accumulate activity counts. Alternatively, accelerometer-based MVPA may illustrate cardiovascular activity with increased heart rate and respiratory frequency over other forms of PA. Accordingly, capturing children’s PA in

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Jana Slaght, Martin Sénéchal and Danielle R. Bouchard

the pedometer data we measured the total number of minutes spent in MVPA per week based on their individualized threshold at 40% VO 2 R. The raw accelerometer data was analyzed to see what activity count was associated with the same number of minutes in MVPA as the pedometer information. For accuracy

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Kelli L. Cain, Edith Bonilla, Terry L. Conway, Jasper Schipperijn, Carrie M. Geremia, Alexandra Mignano, Jacqueline Kerr and James F. Sallis

acceleration in horizontal and perpendicular planes, and activity counts can be expressed as a composite “vector magnitude” (VM) of 3 axes [sqrt(X 2  + Y 2  + Z 2 )]. As vector magnitude (VM) should detect movement that may be common during sedentary time but not easily detected on the vertical plane (ie

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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