Abstract 15733: The Relationship Between Clustering of Cardiovascular Health Behaviors and Physical Fitness Among U.S. Adolescents - Data From the National Health and Nutrition Examination Survey
Introduction: Decreased physical fitness is associated with poor cardiovascular (CV) health. However, little is known about the interactive effect of diet, physical activity (PA), and sedentary time (ST) on fitness among adolescents. By investigating diet, PA, and ST clustering patterns among U.S. adolescents, we hypothesized 1) distinct clustering patterns exist and 2) less healthy clustering patterns are associated with lower physical fitness.
Methods: We used 2003-04 National Health and Nutrition Examination Survey data for persons aged 12-19 years (N=1225). PA and ST were measured by accelerometer, and the AHA Healthy Diet Score quantified diet quality. VO2max was measured by sub-maximal treadmill exercise test. Data were standardized by computing z-scores for diet, PA, and ST. Scores above the mean were labeled “healthy” for diet and PA; scores below the mean were labeled “healthy” for ST. We performed latent-class analysis to identify sex-specific clustering of diet, PA and ST. Adjusting for body mass index (BMI), age and accelerometer wear-time, we performed sex-stratified linear regression analysis to evaluate the association of cluster type with VO2max.
Results: Three clusters were identified for girls and boys (Figure). For girls, there was no difference across clusters for age (p=0.1), weight (p=0.3), and BMI (p=0.5). For boys, cluster 1B was younger (p<0.01) and weighed less than clusters 2B and 3B (p<0.01). There was no difference for BMI (p=0.06). For girls, no relationship existed between clusters and VO2max. For boys, clusters 2B (β=-4.6, p=0.01) and 3B (β=- 6.9, p<0.01) were associated with lower VO2max as compared to 1B (referent).
Conclusions: We observed clustering of diet, PA, and ST in a nationally representative sample of U.S. adolescents. Specific patterns of diet, PA and ST were associated with lower VO2max for boys, suggesting that clustering of health behaviors may help identify adolescent boys most in need of CV risk reduction strategies.
Author Disclosures: J. Hartz: None. L. Yingling: None. C. Ayers: None. T. Powell-Wiley: None.
- © 2016 by American Heart Association, Inc.