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Author: search.filters.author.Tremblay, Mark S

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    Screen-based sedentary behavior and adiposity among school children: Results from International Study of Childhood Obesity, Lifestyle and the Environment (ISCOLE) - Kenya
    (PLOS, 2018) Onywera, Vincent O; Wachira, Lucy-Joy M; Ocholla, Sophie A; Tremblay, Mark S
    Background High levels of sedentary behaviours have been independently associated with several negative health indicators, including obesity. Screen time (ST) is often used as a contributing measure of sedentary time. It is recommended that children spend no more than 2 hours on recreational sedentary screen-based activities daily. We describe screen-based sedentary time of urban school children and examine the associations between body mass index (BMI) and percent Body Fat (%BF) with ST levels. Methods Data were collected from 563 children aged 9 to 11 years attending 29 non-boarding primary schools in Nairobi, Kenya, as part of the International Study of Childhood Obesity, Lifestyle and the Environment (ISCOLE). Data were analysed to test for associations between ST and sex, type of school attended (public verses private), Socioeconomic status, adiposity, and access to electronic devices. We also assessed participants’ ST on school and weekend days. Results Of the participants recruited, 15.5% had high ST levels, 67.9% spent no more than 2 hours in recreational screen activities on school days while 74.2% did not meet the guidelines on weekend days. Participants sex was associated with daily ST (t = 3.5, p<0.001), ST on the weekend (t = 3.9, p <0.001) and total ST per week (t = 3.5, p<0.001) with males having higher ST than females. ST was associated with type of school for daily ST (t = 3.6, p <0.001), ST on the weekend (t = 4.5, p<0.001) and total ST per week (t = 3.6, p<0.001) where private schools pupils had higher ST. ST was not associated with BMI. ST was not associated with %BF except on weekend days (p = 0.038) where those classified as overfat/obese (fat) had higher ST. Conclusions A large proportion of children spend more time than recommended on screen activities particularly on weekend days. Strategies to improve healthy living should focus on the reduction of sedentary ST for school-aged children.
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    Inequality in physical activity, sedentary behavior, sleep duration and risk of obesity in children: a 12-country study
    (Pub Med, 2018) Onywera, Vincent O; Chaput, J.P; Tremblay, Mark S; Sarmiento, OL; Tudor-Locke, C
    Studies examining associations between movement behaviors (i.e. physical activity, sedentary behavior and sleep duration) and obesity focus on average values of these movement behaviors, despite important within-country and between-country variability. A better understanding of movement behavior inequalities is important for developing public health policies and behavior-change interventions. The objective of this ecologic analysis at the country level was to determine if inequality in movement behaviors is a better correlate of obesity than average movement behavior volume in children from all inhabited continents of the world
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    Outdoor time and dietary patterns in children around the world
    (Pub Med, 2018) Onywera, Vincent O; Chaput, Jean-Philippe; Tremblay, Mark S; Sarmiento, Olga L; Tudor-Locke, Catrine; G LeBlanc, Allana
    Whether outdoor time is linked to dietary patterns of children has yet to be empirically tested. The objective of this study was to examine the association between outdoor time and dietary patterns of children from 12 countries around the world.
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    Relationships Between Outdoor Time, Physical Activity, Sedentary Time, and Body Mass Index in Children: A 12-Country Study
    (Pub Med, 2019) Onywera, Vincent O; Sarmiento, Olga L; Tremblay, Mark S; Larouche, Richard; Standage, Martyn; Fogelholm, Mikael
    This study investigated the relationship between outdoor time and physical activity (PA), sedentary time (SED), and body mass index z scores among children from 12 lower-middle-income, upper-middle-income, and high-income countries.
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    Thresholds of physical activity associated with obesity by level of sedentary behavior in children: Physical activity, sedentary behavior, and obesity
    (Research Gate, 2018) Onywera, Vincent O; Tremblay, Mark S; Chaput, Jean-Philippe; Olds, Tims; Lambert, Estelle Victoria; Barnes, Joel D
    It is unknown whether moderate-to-vigorous physical activity (MVPA) thresholds for obesity should be adapted depending on level of sedentary behavior in children.