Longitudinal physical activity and sedentary behavior trends: adolescence to adulthood.
BACKGROUND
There is little national research on longitudinal patterns of physical activity and sedentary behavior in ethnically diverse teens as they transition to adulthood.


METHODS
Longitudinal questionnaire data from U.S. adolescents enrolled in Wave I (1994-1995) and Wave III (2001) of the National Longitudinal Study of Adolescent Health (n =13,030) were analyzed in January 2004. Incidence, reversal, and maintenance of achieving five or more weekly bouts of moderate to vigorous physical activity (MVPA) and < or =14 hours of weekly TV and video viewing, computer/video game use (screen time) were assessed. Multinomial logistic regression models examined the likelihood of achieving five or more weekly sessions of MVPA week and < or =14 hours screen time per week as an adolescent and/or young adult, controlling for household income, parental education, age of adolescent, and seasonality.


RESULTS
Of those achieving five or more weekly sessions of MVPA and < or =14 hours of weekly screen time as adolescents, few continued to achieve these favorable amounts of activity (4.4%) and screen time (37.0%) as adults. More failed to maintain these favorable amounts of activity (31.1%) and screen time (17.3%) into adulthood. Black versus white females were more likely to maintain less [corrected] favorable amounts of activity from adolescence to adulthood (odds ratio [OR]=3.09; 95% confidence interval [CI]=1.49-6.42), while black males (OR=1.50; CI=1.05-2.14) and females (OR=2.00; CI=1.40-2.87) were more likely than whites to maintain less (versus more) favorable screen time hours.


CONCLUSIONS
The vast majority of adolescents do not achieve five or more bouts of moderate physical activity per week, and continue to fail to achieve this amount of activity into adulthood.
Gordon-Larsen
Penny
P
Carolina Population Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27516, USA. gordon_larsen@unc.edu
Nelson
Melissa C
MC
Popkin
Barry M
BM
D000293:Adolescent; D000294:Adolescent Behavior / Q000208:ethnology*; D000328:Adult; D002648:Child; D005006:Ethnicity / Q000706:statistics & numerical data*; D015444:Exercise; D005260:Female; D015438:Health Behavior / Q000208:ethnology*; D006306:Health Surveys; D006801:Humans; D016015:Logistic Models; D008137:Longitudinal Studies; D008297:Male; D017678:Sex Distribution; D013690:Television / Q000706:statistics & numerical data; D014481:United States / Q000453:epidemiology; D018910:Video Games / Q000706:statistics & numerical data