期刊
出版社
BMC
DOI: 10.1186/s12966-015-0274-5
关键词
Accelerometer; Physical activity; Sedentary; Children; Adolescents
资金
- UK Medical Research Council National Prevention Research Initiative (NPRI) [G0701877]
- British Heart Foundation
- Cancer Research UK
- Department of Health
- Economic and Social Research Council
- Medical Research Council
- Research and Development Office for the Northern Ireland Health and Social Services
- Chief Scientist Office, Scottish Executive Health Department
- Stroke Association
- Welsh Assembly Government
- World Cancer Research Fund
- National Institute for Health Research Bristol Nutrition Biomedical Research Unit
- University of Bristol
- National Institute of Health Research (NIHR)
- National Health & Medical Research Council of Australia [APP1026216]
- National Heart Foundation of Australia [100046]
- Diabetes UK
- Economic and Social Research Council [ES/G007462/1] Funding Source: researchfish
- Medical Research Council [MC_PC_15018, G0701877, G0501294, MC_UU_12015/3, MC_U106179473, MC_UP_1001/2, MC_UU_12015/7, MR/K023187/1] Funding Source: researchfish
- National Institute for Health Research [PDF-2010-03-15] Funding Source: researchfish
- ESRC [ES/G007462/1] Funding Source: UKRI
- MRC [MC_U106179473, MC_UU_12015/3, MC_UU_12015/7, G0501294, G0701877, MC_UP_1001/2, MR/K023187/1] Funding Source: UKRI
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.
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