Associations of obesity and body fat distribution with incident atrial fibrillation in the biracial health aging and body composition cohort of older adults - PubMed (original) (raw)

Multicenter Study

Associations of obesity and body fat distribution with incident atrial fibrillation in the biracial health aging and body composition cohort of older adults

Konstantinos N Aronis et al. Am Heart J. 2015 Sep.

Abstract

Obesity is a well-recognized risk factor for atrial fibrillation (AF), yet adiposity measures other than body mass index (BMI) have had limited assessment in relation to AF risk. We examined the associations of adiposity measures with AF in a biracial cohort of older adults. Given established racial differences in obesity and AF, we assessed for differences by black and white race in relating adiposity and AF.

Methods: We analyzed data from 2,717 participants of the Health, Aging, and Body Composition Study. Adiposity measures were BMI, abdominal circumference, subcutaneous and visceral fat area, and total and percent fat mass. We determined the associations between the adiposity measures and 10-year incidence of AF using Cox proportional hazards models and assessed for their racial differences in these estimates.

Results: In multivariable-adjusted models, 1-SD increases in BMI, abdominal circumference, and total fat mass were associated with a 13% to 16% increased AF risk (hazard ratio [HR] 1.14, 95% CI 1.02-1.28; HR 1.16, 95% CI 1.04-1.28; and HR 1.13, 95% CI 1.002-1.27). Subcutaneous and visceral fat areas were not significantly associated with incident AF. We did not identify racial differences in the associations between the adiposity measures and AF.

Conclusion: Body mass index, abdominal circumference, and total fat mass are associated with risk of AF for 10years among white and black older adults. Obesity is one of a limited number of modifiable risk factors for AF; future studies are essential to evaluate how obesity reduction can modify the incidence of AF.

Copyright © 2015 Elsevier Inc. All rights reserved.

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Conflict of interest statement

Conflict of Interest: The authors have no conflict of interest to disclose.

Figures

Figure 1

Figure 1

Multivariable-adjusted restricted cubic splines relating (a) BMI (b) abdominal circumference and risk of AF in whites and blacks participants of the Health ABC cohort. A BMI of 27 mg/kg2 and an abdominal circumference of 99 cm were used as a reference since they represent the median of each variable’s distribution. The solid line demonstrates a progressively increased AF risk in whites and the dashed line demonstrates a progressively increased AF risk in blacks. AF risk increases linearly as BMI and abdominal circumference increase, while there is no significant interaction by race. The shaded areas indicate the 95% confidence intervals.

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