The goal of this research is to implement a novel behavioral program designed to increase physical activity and enhance bone mineralization. The study focuses on sedentary adolescent females, a population at particularly high risk for developing osteoporosis later in life. The investigators hypothesize that the intervention will increase physical activity, that these increases in activity will be associated with changes in specific psychosocial characteristics, and that they will lead to increases in bone formation and bone mineral density over 10 months. The proposed research intends to: (1) test the intervention designed to increase female adolescents' physical activity; (2) evaluate the efficacy of one component of the intervention consisting of an Internet-based exercise diary linked with motivational role model stories; (3) evaluate the respective roles of specific psychosocial characteristics that may predispose toward the adoption and maintenance of physical activity; (4) determine whether positive changes in psychosocial characteristics over time are associated with increased participation in physical activity; and (5) test the hypothesis that increased physical activity enhances bone mineralization. Sedentary adolescent females will be assigned to full intervention (n=100), modified intervention (n=100), or comparison group (n=100) for 10 months. All participants will receive daily calcium supplementation. Bone formation will be assessed at baseline (DEXA), 5 wks and 5 mo. (serum and urinary measures), and 10 mo. (DEXA). Psychosocial characteristics and physical activity participation will be measure at all four intervals.

Agency
National Institute of Health (NIH)
Institute
Eunice Kennedy Shriver National Institute of Child Health & Human Development (NICHD)
Type
Research Project (R01)
Project #
5R01HD037746-02
Application #
6388109
Study Section
Special Emphasis Panel (ZRG1-RPHB-2 (01))
Program Officer
Grave, Gilman D
Project Start
2000-06-19
Project End
2005-05-31
Budget Start
2001-06-01
Budget End
2002-05-31
Support Year
2
Fiscal Year
2001
Total Cost
$335,516
Indirect Cost
Name
University of California Irvine
Department
Social Sciences
Type
Schools of Arts and Sciences
DUNS #
161202122
City
Irvine
State
CA
Country
United States
Zip Code
92697
Schneider, Margaret L; Kwan, Bethany M (2013) Psychological need satisfaction, intrinsic motivation and affective response to exercise in adolescents. Psychol Sport Exerc 14:776-785
Graham, Dan J; Schneider, Margaret; Dickerson, Sally S (2011) Environmental resources moderate the relationship between social support and school sports participation among adolescents: a cross-sectional analysis. Int J Behav Nutr Phys Act 8:34
Schneider, Margaret; Cooper, Dan M (2011) Enjoyment of exercise moderates the impact of a school-based physical activity intervention. Int J Behav Nutr Phys Act 8:64
Schneider, Margaret; Graham, Dan; Grant, Arthur et al. (2009) Regional brain activation and affective response to physical activity among healthy adolescents. Biol Psychol 82:246-52
Schneider, Margaret L; Graham, Dan J (2009) Personality, physical fitness, and affective response to exercise among adolescents. Med Sci Sports Exerc 41:947-55
Schneider, Margaret; Dunn, Andrea; Cooper, Daniel (2009) Affect, exercise, and physical activity among healthy adolescents. J Sport Exerc Psychol 31:706-23
Graham, Dan J; Schneider, Margaret; Cooper, Dan M (2008) Television viewing: moderator or mediator of an adolescent physical activity intervention? Am J Health Promot 23:88-91
Marcuse, L V; Schneider, M; Mortati, K A et al. (2008) Quantitative analysis of the EEG posterior-dominant rhythm in healthy adolescents. Clin Neurophysiol 119:1778-81
Schneider, Margaret; Dunton, Genevieve Fridlund; Cooper, Dan M (2008) Physical Activity and Physical Self-Concept among Sedentary Adolescent Females;An Intervention Study. Psychol Sport Exerc 9:1-14
Schneider, Margaret; Dunton, Genevieve Fridlund; Cooper, Dan Michael (2007) Media use and obesity in adolescent females. Obesity (Silver Spring) 15:2328-35

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