Age-related patterns of vigorous-intensity physical activity in youth: the International Children's Accelerometry Database.

Autor/Urheber	Corder, Kirsten; Sharp, Stephen J; Atkin, Andrew J; Andersen, Lars Bo; Cardon, Greet; Page, Angie S; Davey, Rachel; Grontved, Anders; Hallal, Pedro; Janz, Kathleen F; Kordas, Katarzyna; Kriemler, Susi; Puder, Jardena J; Sardinha, Luis B; Ekelund, Ulf; van
Institution	Elsevier / © The Authors
Titel	Age-related patterns of vigorous-intensity physical activity in youth: the International Children's Accelerometry Database.
Quelle	In: Preventive Medicine Reports(2016) PDF als Volltext kostenfreie Datei
Sprache	englisch
Dokumenttyp	online; Zeitschriftenaufsatz
DOI	10.1016/j.pmedr.2016.05.006
Schlagwörter	ICAD; Motor activity; Child; Adolescent; Epidemiology
Abstract	This is an open access article published by Elsevier and distributed under the terms of the Creative Commons Attribution Licence (CC BY 4.0). ; Physical activity declines during youth but most evidence reports on combined moderate and vigorous-intensity physical activity. We investigated how vigorous-intensity activity varies with age.Cross-sectional data from 24,025 participants (5.0-18.0 y; from 20 studies in 10 countries obtained 2008-2010) providing ≥. 1 day accelerometer data (International Children's Accelerometry Database (ICAD)). Linear regression was used to investigate age-related patterns in vigorous-intensity activity; models included age (exposure), adjustments for monitor wear-time and study. Moderate-intensity activity was examined for comparison. Interactions were used to investigate whether the age/vigorous-activity association differed by sex, weight status, ethnicity, maternal education and region.A 6.9% (95% CI 6.2, 7.5) relative reduction in mean vigorous-intensity activity with every year of age was observed; for moderate activity the relative reduction was 6.0% (5.6%, 6.4%). The age-related decrease in vigorous-intensity activity remained after adjustment for moderate activity. A larger age-related decrease in vigorous activity was observed for girls (-. 10.7%) versus boys (-. 2.9%), non-white (-. 12.9% to -. 9.4%) versus white individuals (-. 6.1%), lowest maternal education (high school (-. 2.0%)) versus college/university (ns) and for overweight/obese (-. 6.1%) versus healthy-weight participants (-. 8.1%). In addition to larger annual decreases in vigorous-intensity activity, overweight/obese individuals, girls and North Americans had comparatively lower average vigorous-intensity activity at 5.0-5.9 y.Age-related declines in vigorous-intensity activity during youth appear relatively greater than those of moderate activity. However, due to a higher baseline, absolute moderate-intensity activity decreases more than vigorous. Overweight/obese individuals, girls, and North Americans appear especially in need of vigorous-intensity activity promotion due to low levels at 5.0-5.9 y and larger negative annual differences.
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