Projects per year
PURPOSE: To describe longitudinal patterns of objectively measured sedentary behavior from age 12 to 16. METHODS: Children participating in the Avon Longitudinal Study of Parents and Children wore accelerometers for one week at age 12, 14 and 16. Participants included boys (n=2591) and girls (n=2845) living in a single geographic location in the U.K. (Bristol). Total minutes per day spent in sedentary behavior, and time spent in blocks of sedentary behavior lasting 10-19 minutes, 20-29 minutes and 30+ minutes are described. Growth curve models were used to determine the rate of change in sedentary behavior from age 12 to 16. RESULTS: At age 12 the boys and girls, on average, were sedentary for 418.0 (67.7) and 436.6 (64.0) minutes per day respectively, and sedentary behavior increased over time to 468.0 (74.3) and 495.6 (68.9) minutes per day at age 14, and to 510.4 (76.6) and 525.4 (67.4) minutes per day at age 16. Growth curve analyses found that total sedentary behavior increased at a rate of 19.5 (0.7) and 22.8 (0.7) minutes per day per year for the boys and girls respectively. The absolute mean increase in total sedentary behavior (+92.4 min/d and +88.8 min/d for the boys and girls respectively) closely matched the mean decrease in light physical activity (-82.2 min/d and -82.9 min/d for the boys and girls respectively, from age 12 to 16. Time spent in continuous sedentary behavior lasting 30+ minutes increased by 121% from age 12 to 16. CONCLUSIONS: Sedentary behavior increased with age, at the expense of light physical activity. The increase in sedentary behavior lasting 30+ minutes in duration contributed greatly to the increase in total sedentary behavior.
|Translated title of the contribution||A Prospective Study of Sedentary Behavior in a Large Cohort of Youth|
|Pages (from-to)||1081 - 1087|
|Number of pages||7|
|Journal||Medicine and Science in Sports and Exercise|
|Publication status||Published - Jun 2012|