Development of sedentary behavior across childhood and adolescence: longitudinal analysis of the Gateshead Millennium Study

International Journal of Behavioral Nutrition and Physical Activity

Research

Jessica K. Reilly¹  Kathryn N. Parkinson¹  Mark S. Pearce²  Kay D. Mann³  Laura Basterfield³  Ashley J. Adamson³  John J. Reilly⁴  Xanne Janssen⁴ 

[1] Human Nutrition Research Centre, Newcastle University, Newcastle upon Tyne, England, UK;Institute of Health & Society, Newcastle University, Newcastle upon Tyne, England, UK;Institute of Health & Society, Newcastle University, Newcastle upon Tyne, England, UK;Human Nutrition Research Centre, Newcastle University, Newcastle upon Tyne, England, UK;University of Strathclyde, School of Psychological Science and Health, Glasgow, Scotland, UK;

关键词: Sitting;    Accelerometry;    Children;    Adolescents;    Longitudinal;    Cohort;   

DOI  :  10.1186/s12966-016-0413-7

 received in 2016-05-06, accepted in 2016-07-20,  发布年份 2016

来源: Springer

【 摘 要 】

BackgroundIn many parts of the world policy and research interventions to modify sedentary behavior of children and adolescents are now being developed. However, the evidence to inform these interventions (e.g. how sedentary behavior changes across childhood and adolescence) is limited. This study aimed to assess longitudinal changes in sedentary behavior, and examine the degree of tracking of sedentary behavior from age 7y to 15y.MethodsParticipants were part of the Gateshead Millennium Study cohort. Measures were made at age 7y (n = 507), 9y (n = 510), 12y (n = 425) and 15y (n = 310). Participants were asked to wear an ActiGraph GT1M and accelerometer epochs were defined as sedentary when recorded counts were ≤25 counts/15 s. Differences in sedentary time and sedentary fragmentation were examined using the Friedman test. Tracking was examined using Spearman’s correlation coefficients and trajectories over time were assessed using multilevel linear spline modelling.ResultsMedian daily sedentary time increased from 51.3 % of waking hours at 7y to 74.2 % at 15y. Sedentary fragmentation decreased from 7y to 15y. The median number of breaks/hour decreased from 8.6 to 4.1 breaks/hour and the median bout duration at 50 % of the cumulative sedentary time increased from 2.4 min to 6.4 min from 7y to 15y. Tracking of sedentary time and sedentary fragmentation was moderate from 7y to 15y however, the rate of change differed with the steepest increases/decreases seen between 9y and 12y.ConclusionIn this study, sedentary time was high and increased to almost 75 % of waking hours at 15y. Sedentary behavior became substantially less fragmented as children grew older. The largest changes in sedentary time and sedentary fragmentation occurred between 9y to 12y, a period which spans the transition to secondary school. These results can be used to inform future interventions aiming to change sedentary behavior.

【 授权许可】

CC BY   
© The Author(s). 2016