Human development and variability in accelerometry-derived physical activity metrics in children
Mini-Oral Presentation C1.7
DOI:
https://doi.org/10.14288/hfjc.v14i3.743Keywords:
Accelerometry, Human Development, VariabilityAbstract
Background: There is a pressing need to develop interventions to increase physical activity and decrease sedentary behaviour in school-aged children. Yet, a better understanding of the degree to which these interventions might be translated across countries at different levels of human development is required. Purpose: To examine the association between levels of human development and sources of variability in accelerometry-derived measures of moderate-to-vigorous physical activity (MVPA) and sedentary time (ST) in 6022 children aged 9–11 years from 12 countries ranging widely in environmental and socio-cultural contexts. Methods: The study design involved recruitment of students, nested within schools, which were nested within study sites. Total and in-school MVPA and ST were measured by waist-worn accelerometry (Actigraph GT3X+). The Human Development Index (HDI) for each country was obtained from the United Nations Development Programme. Results: Associations among the study variables were examined via multi-level models. Across all study sites, the variance in total MVPA and ST explained at the individual level (50.1% to 97.1%) was greater than the variance explained at the school level (2.9% to 49.9%). Similarly, the variance in in-school MVPA and ST explained at the individual level (28.4% to 95.4%) was higher than the proportion of the variance explained at the school level (4.6% to 71.6%). There were negative correlations between HDI and the variance explained by schools for total MVPA (-0.74; p<0.05), total ST (r=-0.55; p=0.06), in-school MVPA (-0.58; p=0.05), and in-school ST (-0.34; p=0.28). Conclusions: The results indicate that higher levels of human development are associated with lower explained variance in total and in-school levels of MVPA and ST. Such findings suggest that school-based physical activity and sedentary behaviour interventions may be less effective in countries with higher levels of human development, and that individual-level interventions may be more effective in these settings. Funding: This study was funded by The Coca-Cola Company. With the exception of requiring that the study be global in nature, the funder had no role in the conduct of the study or interpretation of data.
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Copyright (c) 2021 Peter Katzmarzyk, Stephanie T. Broyles, Jean-Philippe Chaput, Mikael Fogelholm, Gang Hu, Estelle V. Lambert, Carol Maher, Jose A.R. Maia, Tim Olds, Vincent Onywera, Olga L. Sarmiento, Martyn Standage, Mark S. Tremblay, Catrine Tudor-Locke
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