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

International Journal of Behavioral Nutrition and Physical Activity

Ulf Ekelund^1,10  Anna Timperio³  Luis B. Sardinha¹  Jo Salmon³  John J. Reilly^1,14  Jardena J. Puder^1,13  Russ R. Pate^1,17  Susi Kreimler^1,18  Katarzyna Kordas⁴  Kathleen F. Janz²  Pedro Hallal⁵  Karsten Froberg^1,11  Rachel Davey⁸  Greet Cardon^1,16  Sigmund Anderssen^1,10  Lars Bo Andersen^1,11  Esther MF van Sluijs⁶  Dale W. Esliger^1,12  Lauren B. Sherar^1,12  Angie S. Page⁷  Anna Goodman⁹  Ashley R. Cooper^1,15 

[1] Exercise and Health Laboratory, CIPER, Faculty of Human Kinetics, University of Lisbon, Lisbon, Portugal;Department of Health and Human Physiology, University of Iowa, Iowa, USA;Centre for Physical Activity and Nutrition Research, Deakin University, 221 Burwood Highway, Burwood VIC 3125, Australia;School of Social and Community Medicine, University of Bristol, Bristol, UK;Federal University of Pelotas, Pelotas, RS, Brazil;MRC Epidemiology Unit & UKCRC Centre for Diet and Activity Research (CEDAR), University of Cambridge, Cambridge, UK;Centre for Exercise, Nutrition and health Sciences, School for Policy Studies, University of Bristol, Bristol, UK;Centre for Research & Action in Public Health, Health Research Institute, University of Canberra, Canberra ACT 2617, Australia;Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, UK;Department of Sport Medicine, Norwegian School of Sport Sciences, Oslo, Norway;Centre for Research in Childhood Health, Exercise Epidemiology Unit, Department of Sport Sciences and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark;School of Sport, Exercise & Health Sciences, Loughborough University, Loughborough, UK;Centre Hospitalier Universitaire Vaudois (CHUV), Lausanne, Switzerland;School of Psychological Sciences and Health, University of Strathclyde, Glasgow, Scotland;National Institute for Health Research Bristol Biomedical Research Unit in Nutrition, Diet and Lifestyle, Bristol, UK;Department of Movement and Sport Sciences, University of Ghent, Ghent, Belgium;Department of Exercise Science, University of South Carolina, Columbia, USA;Institute of Social and Preventive Medicine, University of Zurich, Zürich, Switzerland

关键词: Adolescents;    Children;    Sedentary;    Physical activity;    Accelerometer;   

Others  :  1231334
DOI  :  10.1186/s12966-015-0274-5

 received in 2015-06-17, accepted in 2015-09-04,  发布年份 2015

【 摘 要 】

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.

【 授权许可】

   
2015 Cooper et al.

【 图 表 】

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