Objectively measured physical activity and sedentary time in youth: the International Children’s Accelerometry Database (ICAD)

Ashley R Cooper, Anna C Goodman, Angie S Page, Lauren Sherar, Dale W Esliger, Esther M F van Sluijs, Lars Bo Andersen, Sigmund Anderssen, Greet Cardon, Rachel Davey, Karsten Froberg, Pedro Hallal, Kathleen F Janz, Katarzyna Kordas, Susi Kreimler, Russell R Pate, Jardena J Puder, John Reilly, Jo Salmon, Luis B SardinhaAnna Timperio, Ulf Ekelund

Research output: Contribution to journalArticle (Academic Journal)

286 Citations (Scopus)
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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.
Original languageEnglish
Article number113
Number of pages10
JournalInternational Journal of Behavioral Nutrition and Physical Activity
Volume12
DOIs
Publication statusPublished - 17 Sep 2015

Keywords

  • Accelerometer
  • Physical activity
  • Sedentary
  • Children
  • Adolescents

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    Cooper, A. R., Goodman, A. C., Page, A. S., Sherar, L., Esliger, D. W., van Sluijs, E. M. F., Andersen, L. B., Anderssen, S., Cardon, G., Davey, R., Froberg, K., Hallal, P., Janz, K. F., Kordas, K., Kreimler, S., Pate, R. R., Puder, J. J., Reilly, J., Salmon, J., ... Ekelund, U. (2015). Objectively measured physical activity and sedentary time in youth: the International Children’s Accelerometry Database (ICAD). International Journal of Behavioral Nutrition and Physical Activity, 12, [113]. https://doi.org/10.1186/s12966-015-0274-5