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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

raised concerns about the effects of a physically inactive lifestyle on children’s health during maturation and across the lifespan, as physical activity (PA) continues to decrease and sedentary time (ST) continues to increase from childhood to adolescence and adulthood. 5 , 6 The association of a

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Jemima C. John, Shreela V. Sharma, Deanna Hoelscher, Michael D. Swartz and Chuck Huber

Physical activity (PA) provides numerous health benefits, such as risk reduction for various chronic diseases, improved cardiovascular and metabolic function, and weight regulation. 1 – 5 PA engagement has also been linked to sound mental health and improved daily functioning 6 – 9 ; individuals

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Nicolas Aguilar-Farias, Sebastian Miranda-Marquez, Pia Martino-Fuentealba, Kabir P. Sadarangani, Damian Chandia-Poblete, Camila Mella-Garcia, Jaime Carcamo-Oyarzun, Carlos Cristi-Montero, Fernando Rodriguez-Rodriguez, Pedro Delgado-Floody, Astrid Von Oetinger, Teresa Balboa-Castillo, Sebastian Peña, Cristobal Cuadrado, Paula Bedregal, Carlos Celis-Morales, Antonio Garcia-Hermoso and Andrea Cortínez-O’Ryan

released the Global Action Plan for Physical Activity to set principles and guidance to global and regional actions. 6 The Global Action Plan for Physical Activity has stated that surveillance and collaborative research are highly relevant to help to develop effective strategies. Also, the Global Action

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Johannes Carl, Gorden Sudeck and Klaus Pfeifer

There is convincing evidence that physical activity (PA) is a key mechanism for the maintenance or promotion of individuals’ health. 1 Importantly, the beneficial effects of PA not only refer to the areas of physiology 2 and disease prevention 3 but also to social interactions 4 and mental well

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Greg Petrucci Jr., Patty Freedson, Brittany Masteller, Melanna Cox, John Staudenmayer and John Sirard

Low prevalence of physical activity (PA) and high levels of sedentary behavior (SB) are independent public health concerns ( Greer, Sui, Maslow, Greer, & Blair, 2015 ; Maher, Mire, Harrington, Staiano, & Katzmarzyk, 2013 ). In response to this problem, considerable research efforts have focused on

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Silvia A. González, Joel D. Barnes, Patrick Abi Nader, Dolores Susana Andrade Tenesaca, Javier Brazo-Sayavera, Karla I. Galaviz, Marianella Herrera-Cuenca, Piyawat Katewongsa, Juan López-Taylor, Yang Liu, Bilyana Mileva, Angélica María Ochoa Avilés, Diego Augusto Santos Silva, Pairoj Saonuam and Mark S. Tremblay

Regular physical activity among children and youth (ie, adolescents) has been consistently associated with decreased adiposity, healthy cardiometabolic biomarkers, improved physical fitness, and better bone health, as well as with favorable psychological and cognitive health outcomes. 1 The public

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Kwok W. Ng, Gorden Sudeck, Adilson Marques, Alberto Borraccino, Zuzana Boberova, Jana Vasickova, Riki Tesler, Sami Kokko and Oddrun Samdal

The overall health benefits of physical activity (PA) are well documented. 1 Among youth, PA is known to have positive effects on cardiovascular, bone, and metabolic health; improving fitness; weight status; sleep; and mental health. 1 , 2 The current guidelines for children between 5 and 18

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Melanna F. Cox, Greg J. Petrucci Jr., Robert T. Marcotte, Brittany R. Masteller, John Staudenmayer, Patty S. Freedson and John R. Sirard

A widely used tool to assess physical activity (PA) and sedentary behavior (SB) is the wearable accelerometer. Accelerometers are often used in free-living settings for surveillance and intervention studies. To quantify the amount and intensity of body movement, prediction models are applied to

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Tamara Vehige Calise, William DeJong, Timothy Heren, Chloe Wingerter and Harold W. Kohl III

those youth under 18 years 2 suggesting the importance of improving this population’s health status. A physically active lifestyle has many health benefits. Individuals who engage in regular physical activity have a lower risk of chronic disease and premature death. 4 Walking, in particular, has been

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Sarah M. Nusser, Nicholas K. Beyler, Gregory J. Welk, Alicia L. Carriquiry, Wayne A. Fuller and Benjamin M.N. King

Background:

Physical activity recall instruments provide an inexpensive method of collecting physical activity patterns on a sample of individuals, but they are subject to systematic and random measurement error. Statistical models can be used to estimate measurement error in activity recalls and provide more accurate estimates of usual activity parameters for a population.

Methods:

We develop a measurement error model for a short-term activity recall that describes the relationship between the recall and an individual’s usual activity over a long period of time. The model includes terms for systematic and random measurement errors. To estimate model parameters, the design should include replicate observations of a concurrent activity recall and an objective monitor measurement on a subsample of respondents.

Results:

We illustrate the approach with preliminary data from the Iowa Physical Activity Measurement Study. In this dataset, recalls tend to overestimate actual activity, and measurement errors greatly increase the variance of recalls relative to the person-to-person variation in usual activity. Statistical adjustments are used to remove bias and extraneous variation in estimating the usual activity distribution.

Conclusions:

Modeling measurement error in recall data can be used to provide more accurate estimates of long-term activity behavior.