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Objectively measured physical activity and sedentary time in youth: the International children’s accelerometry database (ICAD).

Cooper, Ashley R.; Goodman, Anna; Page, Angie S.; Sherar, Lauren B.; Esliger, Dale W.; van Sluijs, Esther M.F; Andersen, Lars Bo; Anderssen, Sigmund A.; Cardon, Greet; Davey, Rachel; Froberg, Karsten; Hallal, Pedro; Janz, Kathleen F.; Kordas, Katarzyna; Kreimler, Susi; Pate, Russell; Puder, Jardena; Reilly, John J.; Salmon, Jo; Sardinha, Luis B.; Timperio, Anna M.; Ekelund, Ulf
Journal article, Peer reviewed
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URI
http://hdl.handle.net/11250/2379462
Date
2015-09-17
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Original version
International Journal of Behavioral Nutrition and Physical Activity. 2015, 12,113. doi:10.1186/s12966-015-0274-5  
Abstract
Background: Physical activity and sedentary behaviour in youth have been reported to vary by sex, age, weight

status and country. However, supporting data are often self-reported and/or do not encompass a wide range of

ages or geographical locations. This study aimed to describe objectively-measured physical activity and sedentary

time patterns in youth.

Methods: The International Children’s Accelerometry Database (ICAD) consists of ActiGraph accelerometer data from

20 studies in ten countries, processed using common data reduction procedures. Analyses were conducted on 27,637

participants (2.8–18.4 years) who provided at least three days of valid accelerometer data. Linear regression was used to

examine associations between age, sex, weight status, country and physical activity outcomes.

Results: Boys were less sedentary and more active than girls at all ages. After 5 years of age there was an average

cross-sectional decrease of 4.2 % in total physical activity with each additional year of age, due mainly to lower levels

of light-intensity physical activity and greater time spent sedentary. Physical activity did not differ by weight status in

the youngest children, but from age seven onwards, overweight/obese participants were less active than their normal

weight counterparts. Physical activity varied between samples from different countries, with a 15–20 % difference

between the highest and lowest countries at age 9–10 and a 26–28 % difference at age 12–13.

Conclusions: Physical activity differed between samples from different countries, but the associations between

demographic characteristics and physical activity were consistently observed. Further research is needed to explore

environmental and sociocultural explanations for these differences.
Description
© Cooper et al. 2015
Publisher
BioMed Central
Journal
International Journal of Behavioral Nutrition and Physical Activity

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