Adiposity and the isotemporal substitution of physical activity, sedentary time and sleep among school-aged children : a compositional data analysis approach

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Dumuid , D , Stanford , T E , Pedisic , Z , Maher , C , Lewis , L K , Martin-Fernandez , J-A , Katzmarzyk , P T , Chaput , J-P , Fogelholm , M , Standage , M , Tremblay , M S & Olds , T 2018 , ' Adiposity and the isotemporal substitution of physical activity, sedentary time and sleep among school-aged children : a compositional data analysis approach ' , BMC Public Health , vol. 18 , 311 . https://doi.org/10.1186/s12889-018-5207-1

Title: Adiposity and the isotemporal substitution of physical activity, sedentary time and sleep among school-aged children : a compositional data analysis approach
Author: Dumuid, Dorothea; Stanford, Tyman E.; Pedisic, Zeljko; Maher, Carol; Lewis, Lucy K.; Martin-Fernandez, Josep-Antoni; Katzmarzyk, Peter T.; Chaput, Jean-Philippe; Fogelholm, Mikael; Standage, Martyn; Tremblay, Mark S.; Olds, Timothy
Contributor: University of Helsinki, Department of Food and Nutrition
Date: 2018-03-02
Language: eng
Number of pages: 10
Belongs to series: BMC Public Health
ISSN: 1471-2458
URI: http://hdl.handle.net/10138/237872
Abstract: Background: Daily activity data are by nature compositional data. Accordingly, they occupy a specific geometry with unique properties that is different to standard Euclidean geometry. This study aimed to estimate the difference in adiposity associated with isotemporal reallocation between daily activity behaviours, and to compare the findings from compositional isotemporal subsitution to those obtained from traditional isotemporal substitution. Methods: We estimated the differences in adiposity (body fat%) associated with reallocating fixed durations of time (isotemporal substitution) between accelerometer-measured daily activity behaviours (sleep, sedentary time and light and moderate-to-vigorous physical activity (MVPA)) among 1728 children aged 9-11 years from Australia, Canada, Finland and the UK (International Study of Childhood Obesity, Lifestyle and the Environment, 2011-2013).We generated estimates from compositional isotemporal substitution models and traditional non-compositional isotemporal substitution models. Results: Both compositional and traditional models estimated a positive (unfavourable) difference in body fat% when time was reallocated from MVPA to any other behaviour. Unlike traditional models, compositional models found the differences in estimated adiposity (1) were not necessarily symmetrical when an activity was being displaced, or displacing another (2) were not linearly related to the durations of time reallocated, and (3) varied depending on the starting composition. Conclusion: The compositional isotemporal model caters for the constrained and therefore relative nature of activity behaviour data and enables all daily behaviours to be included in a single statistical model. The traditional model treats data as real variables, thus the constrained nature of time is not accounted for, nor reflected in the findings. Findings from compositional isotemporal substitution support the importance of MVPA to children's health, and suggest that while interventions to increase MVPA may be of benefit, attention should be directed towards strategies to avoid decline in MVPA levels, particularly among already inactive children. Future applications of the compositional model can extend from pair-wise reallocations to other configurations of time-reallocation, for example, increasing MVPA at the expense of multiple other behaviours.
Subject: Physical activity
sedentary behaviour
sleep
isotemporal substitution
adiposity
HEALTH INDICATORS
BODY-COMPOSITION
EPIDEMIOLOGY
ADOLESCENTS
CHILDHOOD
VALIDITY
BEHAVIOR
DISEASE
YOUTH
3142 Public health care science, environmental and occupational health
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