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Alex V. Rowlands

available. All are waterproof and suitable to wear at multiple wear-sites but have been primarily marketed for wrist-wear. Capture of Physical Behaviors 24 Hours a Day Being wrist-worn and waterproof makes the monitors suitable to wear day and night, meaning physical behaviors (sleep, sedentary behavior

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Jairo H. Migueles, Alex V. Rowlands, Florian Huber, Séverine Sabia and Vincent T. van Hees

physical behavior. Impact The main value of GGIR is that it offers a broad set of functionalities ranging from data quality handling to 24 hours/7 days time use characterization of physical activity and sleep utilizing literature supported methods, and is study population agnostic making it suitable for a

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Patty Freedson

sedentary behavior. She explained why she did this study, her opinion about the value of using a wearable device to assess physical behavior, and her thoughts about future directions for those of us whose research focus is on measuring physical behavior. This interview is followed by a brief commentary by

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Patty Freedson

such fundamental and applied problems related to physical behavior measurement, and is a much-needed resource to advance the science and practice of monitoring physical behavior. The journal publishes papers in novel methods for device calibration and validation, new sensor technology, analytic

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Declan J. Ryan, Jorgen A. Wullems, Georgina K. Stebbings, Christopher I. Morse, Claire E. Stewart and Gladys L. Onambele-Pearson

It is becoming evident that sedentary behavior (SB) affects a number of physiological parameters independent of the amount of moderate- to vigorous-intensity physical activity (MVPA) engagement. 1 , 2 With time being finite within a day (ie, 24-h end point), engagement in one physical behavior (PB

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Dinesh John, Qu Tang, Fahd Albinali and Stephen Intille

Accelerometer-based devices offer unprecedented potential to study the impact of human physical behavior patterns on health ( Doherty et al., 2017 ; Wright, Brown, Collier, & Sandberg, 2017 ). Thus, the National Institutes of Health (NIH) and the Food and Drug Administration aim to advance

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Declan Ryan, Jorgen Wullems, Georgina Stebbings, Christopher Morse, Claire Stewart and Gladys Onambele-Pearson

improve heath, 17 , 18 either directly or indirectly. With technological improvements, it is now possible to accurately quantify the physical behavior (PB) levels (SB and PA time). Thigh-mounted triaxial accelerometers are considered the gold standard for SB time quantification as posture can be

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Vera Ramos, Eliana V. Carraça, Teresa Paiva and Fátima Baptista

). Furthermore, sedentary elders with functional limitations have poorer SQ ( Fragoso et al., 2014 ). Thus, SQ in older adults appears to be particularly relevant to their physical functioning and health ( Holfeld & Ruthig, 2014 ; Spira et al., 2012 ). As stated, physical behaviors and capacities/abilities may

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Alex V. Rowlands

2016 has been an exciting year for research in physical activity, inactivity and health. Recognition of the importance of all physical behaviors (physical activity, sedentary time and sleep) across the 24-hr day continues to grow. Notable advances have included: applications of recent methodological innovations that account for the codependence of the behaviors in the finite 24-hr period showing that the balance of these behaviors is associated with health; methodological innovations focusing on the classification of behaviors and/or quantification of the 24-hr diurnal activity pattern; and a series of systematic reviews that helped provide the evidence base for the release of the innovative 24-hr movement guidelines earlier this year. This commentary focuses on just two of these papers: the first by Goldsmith and colleagues who demonstrate a new statistical method that exploits the time series nature of accelerometer data facilitating new insights into time-specific determinants of children’s activity patterns and associations with health; the second by Tremblay and colleagues who describe the evidence base for associations between each physical behavior and children’s health, the emerging evidence base for associations between the balance of behaviors and health, and development of the world’s first 24-hr movement guidelines.

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Aristides M. Machado Rodrigues, Manuel J. Coelho e Silva, Jorge Mota, Sean P. Cumming, Lauren B. Sherar, Helen Neville and Robert M. Malina

Sex differences in physical activity (PA) through pubertal maturation and the growth spurt are often attributed to changing interests. The contribution of sex differences in biological maturation to the adolescent decline has received limited attention. This study examined the contribution of somatic maturation to sex differences in objective assessments of sedentary behavior and PA in Portuguese adolescents (N = 302, aged 13–16 years). Maturation was estimated from the percentage of predicted mature stature and physically active and inactive behaviors assessed with Actigraph GT1M accelerometers. The influence of age, sex and their interaction on body size, maturation and physical behaviors were examined using factorial ANOVA and, subsequently, ANCOVA (controlling for maturation) tested the effect of sex. Males spent more time in MVPA and less time in sedentary behavior than females. However, sex differences were attenuated when maturation was controlled; thus suggesting that maturity may play an important role in adolescent behaviors.