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Sara Knaeps, Stijn De Baere, Jan Bourgois, Evelien Mertens, Ruben Charlier and Johan Lefevre

The cardiometabolic health benefits of physical activity can no longer be denied, as the lack of physical activity is one of the most important predictors of mortality and burden of disease. 1 Lately, sedentary time has also been confirmed as a cardiometabolic health risk in itself, and meeting

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

, several studies show that better SQ is associated with higher levels of physical activity ( Baron, Reid, & Zee, 2013 ; Holfeld & Ruthig, 2014 ; Lambiase, Gabriel, Kuller, & Matthews, 2013 ), but the impact of sedentary time on the quality of sleep of older adults seems to be small or nonexistent

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Erika Rees-Punia, Alicia Holloway, David Knauft and Michael D. Schmidt

Over recent decades, childhood physical inactivity and sedentary time have become a main focus of public health efforts across the developed world. Physical activity interventions for children have been associated with a decrease in percentage of body fat, triglycerides, and systolic blood pressure

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Danilo R. Silva, Cláudia S. Minderico, Pedro B. Júdice, André O. Werneck, David Ohara, Edilson S. Cyrino and Luís B. Sardinha

more comprehensive approach to measuring sedentary time. 5 , 6 Given that physical activity and sedentary behavior are closely associated, the dissemination of objective methods to evaluate physical activity, especially movement sensors (eg, pedometers, accelerometers), 7 helps to estimate sedentary

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Albert R. Mendoza, Kate Lyden, John Sirard, John Staudenmayer, Catrine Tudor-Locke and Patty S. Freedson

that adults accumulate at least 7,000 steps/day ( American College of Sports Medicine, 2017 ). Additionally, there is evidence that prolonged sedentary time (ST) is associated with morbidity and mortality ( Katzmarzyk, Church, Craig, & Bouchard, 2009 ; van der Ploeg, Chey, Korda, Banks, & Bauman, 2012

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

There is growing interest in sedentary time (ST) and its association with health outcomes. Although some studies ( 4 , 14 , 17 ) have examined the association between ST and health in children, these studies have largely been cross-sectional in nature, limiting the conclusions that can be drawn on

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Richard Larouche, Emily F. Mire, Kevin Belanger, Tiago V. Barreira, Jean-Philippe Chaput, Mikael Fogelholm, Gang Hu, Estelle V. Lambert, Carol Maher, José Maia, Tim Olds, Vincent Onywera, Olga L. Sarmiento, Martyn Standage, Catrine Tudor-Locke, Peter T. Katzmarzyk, Mark S. Tremblay and For the ISCOLE Research Group

gender. Moreover, previous studies conducted in a single country or region may provide less variability in environmental conditions. Therefore, this study aimed to investigate whether outdoor time is associated with PA levels, sedentary time (SED), and body mass index (BMI) z scores in a large sample

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Diana Castaneda-Gameros, Sabi Redwood and Janice L. Thompson

). Despite the known benefits, PA declines with age and consequently, older adults tend to spend many hours being sedentary ( Matthews et al., 2015 ). Although previous studies have investigated the association between PA and sedentary time (ST; time spent sitting or lying) and frailty ( Blodgett, Theou

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Sungchul Lee, Sangyoon Lee, Seongryu Bae, Kazuhiro Harada, Songee Jung, Keitaro Makino and Hiroyuki Shimada

levels that are similar to older individuals in the general population ( George, Rosenkranz, & Kolt, 2013 ). On the other hand, national U.S. data show a strong relationship between longer sedentary time and presence of disability, independent of time spent performing moderate or vigorous physical

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Claudia Fischer, Mine Yılıdrım, Jo Salmon and Mai J.M. Chinapaw

Actigraph accelerometers are hypothesized to be valid measurements for assessing children’s sedentary time. However, there is considerable variation in accelerometer cut-points used. Therefore, we compared the most common accelerometer sedentary cut-points of children performing sedentary behaviors. Actigraph Actitrainer uniaxial accelerometers were used to measure children’s activity intensity (29 children, 5-11 years old) during different activities, namely playing computer games, nonelectronic sedentary games, watching television and playing outdoors. A structured protocol was the criterion for assessing the validity of four common cut-points (100, 300, 800, 1100 counts/minute). The median counts during all sedentary behaviors were below the lowest comparison cut-point of 100 cpm. The 75th percentile values for the sedentary behaviors were always below the cut-point of 300 cpm. Our results suggest that the cut-point of <100 cpm is the most appropriate.