Race, Age, and Allostatic Load Among Men in the Nashville Stress and Health Study.

High allostatic load (AL), a measure of physiological dysregulation, has been linked with premature morbidity and mortality. There is a paucity of research assessing AL among non-Hispanic Black (NHB) and non-Hispanic White (NHW) American men of various age groups. This study investigated racial differences in AL among NHB and NHW adult men and assessed whether racial differences in AL varied by age. Data were drawn from NHB (n = 232) and NHW (n = 246) men in the Nashville Stress and Health Study. AL was based on the sum of 10 biomarkers that was dichotomized as high AL (four or more high-risk biomarkers) or low AL (fewer than four high-risk biomarkers). Modified Poisson regression models were estimated to assess race differences in AL, adjusting for age, socioeconomic status (SES), and health behaviors. Interactions assessed whether racial differences in AL varied between young (22-49 years) and older (50-69) men. NHB men had a higher prevalence of being in the high AL group (prevalence ratio [PR] = 1.54, confidence interval [CI] = [1.09, 2.18]), relative to NHW men in the total sample. Among young men ages 22 to 49 years, NHB men had a higher prevalence of being in the high AL group (PR = 2.09, CI = [1.25, 3.49]), relative to NHW men. Among older men ages 50 to 69 years, there were no racial differences in AL. Findings underscore the importance of identifying factors that are associated with high AL, which is critical to mitigate premature morbidity and mortality, among NHB men.