Writing about justice and injustice: Complex effects on affect, performance, threat, and biological responses to acute social stress among african American women and men

Salivary uric acid dynamics are associated with stress response hormones among African American in an urban sample

Acute physiological responses to psychosocial stressors are a potential pathway underlying racial disparities in stress-related illnesses. Uric acid (UA) is a potent antioxidant that has been linked to disparities in stress-related illnesses, and recent research has shown that UA is responsive to acute social stress. However, an examination of the relationships between the purinergic system and other commonly measured stress systems is lacking. Here, we measure and characterize associations of salivary uric acid (sUA) with markers of hypothalamic-pituitary-adrenal (HPA) axis activation, sympathetic-adreno-medullar (SAM) axis activation, and acute inflammation. A community sample of 103 African Americans (33 male, 70 female) completed the Trier Social Stress Test to induce social-evaluative threat. Passive drool collected before, during, and after the stressor task provided salivary reactivity measures of UA (sUA), cortisol, dehydroepiandrosterone sulfate (DHEAS), salivary alpha amylase (sAA - a surrogate marker of SAM activity) and C-reactive protein (sCRP). Multiple regressions revealed that total activation of cortisol, DHEAS, and sCRP were each positively associated with higher total activation of sUA. Additionally, DHEAS reactivity was positively associated with sUA reactivity. Relationships between HPA-axis markers and sUA were especially observed among younger and male participants. Overall, findings suggest potential coordination of stress systems with sUA in response to acute stress, which may further the contributions of biological stress processes to racial health disparities.

Attribution for everyday discrimination typologies and mortality risk among older black adults: Evidence from the health and retirement study?

BACKGROUND

The present study assessed how attributions of everyday discrimination typologies relate to all-cause mortality risk among older Black adults.

METHODS

This study utilized data from a subsample of older Black adults from the 2006/2008 Health and Retirement Study (HRS). Attributions for everyday discrimination (i.e., ancestry, age, gender, race, physical appearance, physical disability, sexual orientation, weight, and other factors) were based on self-reports, while their vital statuses were obtained from the National Death Index and reports from key informants (spanning 2006-2019). We applied latent class analysis (LCA) to identify subgroups of older Black adults based on their attributions to everyday discrimination. Cox proportional hazards models were used to analyze time to death as a function of LCA group membership and other covariates.

RESULTS

Based on fit statistics, we selected a four-class model that places respondents into one of the following classes: Class One (7%) attributed everyday discrimination to age, race, and physical disability; Class Two (72%) attributed everyday discrimination to few/no sources, Class Three (19%) attributed everyday discrimination to race and national origin; and Class Four (2%) attributed everyday discrimination to almost every reason. After adjusting for sociodemographic, behavioral, multisystem physiological dysregulation, and socioeconomic characteristics, we found that the relative risk of death remained higher for the respondents in Class One (Hazard Ratio [H.R.]: 1.80, 95% Confidence Interval [C.I.]: (1.09-2.98) and Class Four (H.R.: 3.92, 95% C.I.: 1.62-9.49) compared to respondents in Class Two.

CONCLUSIONS

Our findings illustrate the utility of using attribution for everyday discrimination typologies in research on the psychosocial dimensions of mortality risk among older Black adults. Future research should assess the mechanisms that undergird the link between everyday discrimination classes and all-cause mortality risk among older Black adults.