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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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Laura E. Juliff, Jeremiah J. Peiffer and Shona L. Halson

piezoelectric accelerometer, which sampled activity counts in 1-minute epochs. Epoch-for-epoch concordance rates of 81% to 90% with polysomnography (gold standard sleep measure) have been found for sleep/wake activity using Actical® wrist actigraphy monitors. 14 Participants wore the monitor at all times

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Karen C. Smith, Griffin L. Michl, Jeffrey N. Katz and Elena Losina

above 175 steps per minute. We included days with at least 10 hours of wear time and, per CDC guidelines, counted minutes of MVPA in bouts of 10 minutes, with 2 “grace minutes” during which steps could fall beneath the threshold. 32 Each minute of vigorous physical activity counted as 2 minutes of

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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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Berit Steenbock, Marvin N. Wright, Norman Wirsik and Mirko Brandes

, and are increasingly being used in studies with very young children ( Hills et al., 2014 ). However, traditional linear model equations developed for activity count-based data do not provide accurate estimates of EE in preschoolers ( Janssen et al., 2013 ; Reilly et al., 2006 ). Because the

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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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Christopher Kuenze, Lisa Cadmus-Bertram, Karin Pfieffer, Stephanie Trigsted, Dane Cook, Caroline Lisee and David Bell

period. Freedson Adult VM3 cut points were then used to categorize physical activity as light, moderate, vigorous, or very vigorous based on the number of activity counts that occurred per minute during periods of wear time. 33 Based on the use of these cut points, we were able to calculate the amount

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Neng Wan, Ming Wen, Jessie X. Fan, O. Fahina Tavake-Pasi, Sara McCormick, Kirsten Elliott and Emily Nicolosi

.4278/0890-1171-10.4.282 10159709 42. Carlson RH Jr , Huebner DR , Hoarty CA , et al . Treadmill gait speeds correlate with physical activity counts measured by cell phone accelerometers . Gait Posture . 2012 ; 36 ( 2 ): 241 – 248 . PubMed doi:10.1016/j.gaitpost.2012.02.025 10.1016/j.gaitpost.2012.02.025 22475727

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Evelin Lätt, Jarek Mäestu and Jaak Jürimäe

GT1M accelerometer (ActiGraph LLC, Pensacola, FL). Each participant was asked to wear the monitor on the right hip for 7 consecutive days, except when sleeping or in conditions the accelerometer could get wet (swimming, bathing, sauna, etc). The accelerometer was programmed to record activity counts