Physical Activity, Cardiovascular Fitness, and Insulin Sensitivity Among U.S. Adolescents

OBJECTIVE—The purpose of this study was to examine the association of physical activity and cardiovascular fitness (CVF) with insulin sensitivity in a nationally representative sample of U.S. youth. RESEARCH DESIGN AND METHODS—The study included 1,783 U.S. adolescents (11% Mexican American, 14% non-Hispanic black, 63% non-Hispanic white, and 12% other) aged 12–19 years who were examined in the 1999–2002 National Health and Nutrition Examination...