Physical activity level and sedentary time in Norwegian adolescents
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Background: Physical activity (PA) is necessary for children and adolescents to obtain a healthy development. The environment, however, facilitates the sedentary lifestyle. World health organization (WHO) defines physical inactivity as the fourth major risk factor for mortality. Still, adolescents in Europe and America are sedentary more than 50 % of their waking hours. Lack of comparability between studies investigating PA level and sedentary time in adolescents creates need for further documentation. Objective: The objective was to investigate PA level and sedentary time in Norwegian 15-year olds. In addition, I wanted to study whether sedentary time and moderate-to-vigorous PA (MVPA) were associated with waist circumference (WC) and body mass index (BMI). Method: Data was drawn from the cross-sectional part of the PANCS2 (2011). A total of 1046 15-year-old boys and girls were included to represent the Norwegian adolescent population. PA and sedentary time were assessed objectively by ActiGraph accelerometers. Measurements of BMI (in kg/m2) and WC were taken by trained investigators. The International Obesity Task Force cut-offs were used to define overweight and obese subjects. Analyzes conducted were independent and dependent t-test, Chisquare test, Pearson’s correlation, univariat, and multivariate regression. Results: The adolescents had a mean (SD) PA level of 456 (160) counts per minute. The mean PA level was higher during the week compared to the weekend. The recommendations of 60 minutes of MVPA were reached by 50.7 %. Boys were significantly more active than girls. The participants spent 71 % of the measured time being sedentary, and girls were more sedentary than boys. Sedentary time was not associated with either WC or BMI, while MVPA was associated with both variables. Conclusion: The adolescent’s PA level is not favorable, and the 2 amount of time spent sedentary is concerning. There is a difference in PA level between week and weekend, and between the sexes. Sedentary time was not associated with WC or BMI, while MVPA was associated with both variables.
Masteroppgave - Norges idrettshøgskole, 2013