Abstract MP04: 25 year Physical Activity Trajectories and Development of Subclinical Coronary Artery Disease as Measured by Coronary Artery Calcium: the CARDIA Study
Background: Physical activity (PA) has been shown to be protective against the development of clinical cardiovascular disease. There is paucity of data regarding the association of long term PA patterns and development of subclinical atherosclerosis, as measured by coronary artery calcium (CAC). Studies so far are limited by evaluation of PA only at baseline. The goal of this study was to identify 25 year patterns of PA from young to middle age and its association with development of CAC.
Methods: CARDIA is a prospective longitudinal study of black and white men and women, ages 18-30 years at baseline in 1985-86, with up to 7 follow-up exams over 25 years of follow-up. PA was determined at each exam by a questionnaire that assessed typical PA during the past 12 months for 13 types of activities. Men and women who had at least 3 measures of PA during the 25 years of follow up and CAC assessment at the Year 25 exam were included (N= 3178). CARDIA Physical Activity Score > 300 units is approximately equivalent to >150 min/week of moderate or vigorous physical activity and was considered as meeting PA guidelines (MPAG). Latent class modeling was used to identify unique trajectories of PA. Odds ratios for CAC were estimated from a multivariable logistic model controlling for age, sex, ethnicity, hypertension, diabetes, BMI, smoking status and education.
Results: Our analyses showed 5 unique PA trajectories (figure). 1. Maintaining-not MPAG (46.5%); 2. maintaining-MPAG (35.6%); 3 increasing-MPAG (8.5%); 4. decreasing-MPAG (6.5%), and 5. maintaining- > 3 fold MPAG (2.4%). Compared with the maintaining-not MPAG, the multivariable adjusted odds ratio for presence of CAC (non-zero CAC score) was 1.02 (95% CI, 0.84-1.24) for maintaining-MPAG, 1.07 (95% CI, 0.78-1.44) for increasing-MPAG , 1.01(95% CI, 0.72- 1.41) for decreasing-MPAG , and 1.37 (95% CI, 0.82-2.27) for maintaining- > 3 fold MPAG.
Conclusion: Long-term trajectories for levels of PA through young adulthood are not associated with development of subclinical atherosclerosis by middle age.
Author Disclosures: J.S. Rana: None. R. Murillo: None. C.P. Quesenberry: None. M.E. Sorel: None. B. Sternfeld: None. K.P. Gabriel: None. M.R. Carnethon: None. K. Liu: None. J.P. Reis: None. N.B. Allen: None. D. Lloyd-Jones: None. J. Carr: None. S. Sidney: None.
- © 2015 by American Heart Association, Inc.