Many youth find television, videos and computer games to be very reinforcing, and they choose to be sedentary rather than physically active. Sedentary behaviors can influence energy balance and body weight by reducing physical activity and increasing energy intake. Research from our laboratory has shown that reducing sedentary behavior can increase physical activity and decrease energy intake, but there is substantial variability in the response of youth to reductions in sedentary behavior. The present proposal is designed to extend our research and explore theoretical models that may help understand why youth vary in their response to increase physical activity when targeted sedentary behaviors are reduced. We hypothesize that the increase in physical activity when sedentary behaviors are reduced is related to the relative reinforcing value (RRV) of physical activity to sedentary behaviors. The RRV of physical activity is a measure of the motivation to be active in youth, and overweight youth who are inactive find physical activity relatively less reinforcing than less overweight youth. We predict that RRV of physical activity will be positively related to the substitution of total physical activity and physical activity in the moderate to vigorous intensity range for sedentary behaviors when targeted sedentary behaviors are reduced. To test this hypothesis, we will study 60 overweight and at risk for overweight 8-12 year-old youth who differ in the RRV of physical activity to sedentary behavior, with equal numbers of boys and girls, in 3 phases: baseline, and reduce television watching from baseline by 25 percent and 50 percent. Each phase will be implemented for three weeks. Order of experimental phases will be counterbalanced across subjects. It is also predicted that reducing sedentary behavior will reduce energy intake and dietary fat intake, and the reduction in energy intake will be greatest for youth with stronger association between eating with television watching and other targeted sedentary behaviors. Liking and outcome expectancy of physical activity will be studied as additional predictors of substitution of physical activity for reductions in sedentary behaviors. Developing a better understanding of why obese youth increase physical activity or decrease energy intake when sedentary behaviors are reduced is important for the treatment of pediatric obesity. ? ? ?

Agency
National Institute of Health (NIH)
Institute
Eunice Kennedy Shriver National Institute of Child Health & Human Development (NICHD)
Type
Research Project (R01)
Project #
5R01HD039778-06
Application #
7242571
Study Section
Psychosocial Risk and Disease Prevention Study Section (PRDP)
Program Officer
Grave, Gilman D
Project Start
2001-03-01
Project End
2009-04-30
Budget Start
2007-05-01
Budget End
2008-04-30
Support Year
6
Fiscal Year
2007
Total Cost
$307,807
Indirect Cost
Name
State University of New York at Buffalo
Department
Pediatrics
Type
Schools of Medicine
DUNS #
038633251
City
Buffalo
State
NY
Country
United States
Zip Code
14260
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Epstein, Leonard H; Raja, Samina; Daniel, Tinuke Oluyomi et al. (2012) The built environment moderates effects of family-based childhood obesity treatment over 2 years. Ann Behav Med 44:248-58
Epstein, Leonard H; Roemmich, James N; Cavanaugh, Meghan D et al. (2011) The motivation to be sedentary predicts weight change when sedentary behaviors are reduced. Int J Behav Nutr Phys Act 8:13
Carr, Katelyn A; Epstein, Leonard H (2011) Relationship between food habituation and reinforcing efficacy of food. Learn Motiv 42:165-172
Epstein, Leonard H; Wrotniak, Brian H (2010) Future directions for pediatric obesity treatment. Obesity (Silver Spring) 18 Suppl 1:S8-12
Epstein, Leonard H; Dearing, Kelly K; Erbe, Richard W (2010) Parent-child concordance of Taq1 A1 allele predicts similarity of parent-child weight loss in behavioral family-based treatment programs. Appetite 55:363-6
Rollins, Brandi Y; Dearing, Kelly K; Epstein, Leonard H (2010) Delay discounting moderates the effect of food reinforcement on energy intake among non-obese women. Appetite 55:420-5
Epstein, Leonard H; Dearing, Kelly K; Paluch, Rocco A et al. (2007) Price and maternal obesity influence purchasing of low- and high-energy-dense foods. Am J Clin Nutr 86:914-22
Epstein, Leonard H; Temple, Jennifer L; Neaderhiser, Brad J et al. (2007) Food reinforcement, the dopamine D2 receptor genotype, and energy intake in obese and nonobese humans. Behav Neurosci 121:877-86
Epstein, Leonard H; Beecher, Meghan D; Graf, Jennifer L et al. (2007) Choice of interactive dance and bicycle games in overweight and nonoverweight youth. Ann Behav Med 33:124-31

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