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Physical activity intensity, bout-duration, and cardiometabolic risk markers in children and adolescents

  • Tarp, Jakob
  • Child, Abbey
  • White, Tom
  • Westgate, Kate
  • Bugge, Anna
  • Grøntved, Anders
  • Wedderkopp, Niels
  • Andersen, Lars
  • Cardon, Greet
  • Davey, Rachel
  • Janz, Kathleen
  • Kriemler, Susi
  • Northstone, Kate
  • Page, Angie
  • Puder, Jardena
  • Reilly, John
  • Sardinha, Luis
  • van Sluijs, Esther
  • Ekelund, Ulf
  • Wijndaele, Katrien
  • And 1 more
Publication Date
Jan 01, 2018
Ghent University Institutional Archive
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Objectives: To determine the role of physical activity intensity and bout-duration in modulating associations between physical activity and cardiometabolic risk markers. Methods: A cross-sectional study using the International Children's Accelerometry Database (ICAD) including 38,306 observations (in 29,734 individuals aged 4-18 years). Accelerometry data was summarized as time accumulated in 16 combinations of intensity thresholds (>= 500 to >= 3000 counts/min) and bout-durations (>= 1 to >= 10 min). Outcomes were body mass index (BMI, kg/m(2)), waist circumference, biochemical markers, blood pressure, and a composite score of these metabolic markers. A second composite score excluded the adiposity component. Linear mixed models were applied to elucidate the associations and expressed per 10 min difference in daily activity above the intensity/bout-duration combination. Estimates (and variance) from each of the 16 combinations of intensity and bout-duration examined in the linear mixed models were analyzed in meta-regression to investigate trends in the association. Results: Each 10 min positive difference in physical activity was significantly and inversely associated with the risk factors irrespective of the combination of intensity and bout-duration. In meta-regression, each 1000 counts/min increase in intensity threshold was associated with a -0.027 (95% CI: -0.039 to -0.014) standard deviations lower composite risk score, and a -0.064 (95% CI: -0.09 to -0.038) kg/m(2) lower BMI. Conversely, meta-regression suggested bout-duration was not significantly associated with effect-sizes (per 1 min increase in bout-duration: -0.002 (95% CI: -0.005 to 0.0005) standard deviations for the composite risk score, and -0.005 (95% CI: -0.012 to 0.002) kg/m(2) for BMI). Conclusions: Time spent at higher intensity physical activity was the main determinant of variation in cardiometabolic risk factors, not bout-duration. Greater magnitude of associations was consistently observed with higher intensities. These results suggest that, in children and adolescents, physical activity, preferably at higher intensities, of any bout-duration should be promoted.

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