Abstract
Introduction: Frailty, an increased vulnerability to stressors, is associated with adverse health outcomes. Cardiovascular disease (CVD) is associated with frailty, but whether circulating cardiac biomarkers of subclinical myocardial injury and strain (e.g., high-sensitivity cardiac troponin T [hs-cTnT] and natriuretic peptide [NT-proBNP]) are associated with frailty is unknown. Methods: We conducted a cross-sectional analysis of levels of hs-cTnT and NT-proBNP assessed among participants of the ARIC study at visit 5 (2011-2013, mean age: 75.5 years, 42% male, 21% Black). We used the Fried frailty phenotype that counts the presence of each component (weight loss, low physical activity, slow gait, exhaustion, and low grip strength) to classify participants as frail (≥3), pre-frail (1-2), or robust (0 components). Participants without prevalent CVD (stroke, myocardial infarction, or heart failure) were classified into hs-cTnT and NT-proBNP quartiles; those with prevalent CVD were considered in a separate group. Using adjusted multinomial logistic regression models, we tested the hypothesis that hs-cTnT and NT-proBNP are positively associated with odds of being pre-frail and frail, vs. robust. Results: Among 5,162 participants, 1,039 had prevalent CVD (20%), 2,447 (48%) were pre-frail, and 358 (7%) frail. Biomarker concentrations had graded associations with frailty and pre-frailty, vs. robust. Estimates comparing the 4 th vs. 1 st quartile, (e.g., hs-cTnT frail vs. robust OR=4.37 [95% CI: 2.69-7.09]) were similar to those observed for prevalent CVD vs. 1 st quartile (e.g., hs-cTnT frail vs. robust OR=5.11 [3.19-8.17]). All frailty components were positively associated with cardiac biomarker concentrations and CVD (Table), except exhaustion with NT-proBNP. Conclusions: Cardiac biomarker concentrations, even in the absence of CVD, may help identify people at greater risk for frailty. Future research should examine the role of changes in biomarkers from mid-life on the risk of frailty
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