Epigenetic age acceleration mediates the relationship between neighborhood deprivation and pain severity in adults with or at risk for knee osteoarthritis pain

An estimated 250 million people worldwide suffer from knee osteoarthritis (KOA), with older adults having greater risk. Like other age-related diseases, residents of high-deprivation neighborhoods experience worse KOA pain outcomes compared to their more affluent neighbors. The purpose of this study was to examine the relationship between neighborhood deprivation and pain severity in KOA and the influence of epigenetic age acceleration (EpAA) on that relationship. The sample of 128 participants was mostly female (60.9%), approximately half non-Hispanic Black (49.2%), and had a mean age of 58 years. Spearman bivariate correlations revealed that pain severity positively correlated with EpAA (ρ = 0.47, p ≤ 0.001) and neighborhood deprivation (ρ = 0.25, p = 0.004). We found a positive significant relationship between neighborhood deprivation and EpAA (ρ = 0.47, p ≤ 0.001). Results indicate a mediating relationship between neighborhood deprivation (predictor), EpAA (mediator), and pain severity (outcome variable). There was a significant indirect effect of neighborhood deprivation on pain severity through EpAA, as the mediator accounted for a moderate portion of the total effect, PM = 0.44. Epigenetic age acceleration may act as a mechanism through which neighborhood deprivation leads to worse KOA pain outcomes and may play a role in the well-documented relationship between the neighborhood of residence and age-related diseases.

Sex and Gender and Allostatic Mechanisms of Cardiovascular Risk and Disease

Cardiovascular diseases are leading causes of mortality and morbidity in adults worldwide. Multiple studies suggest that there are clinically relevant sex differences in cardiovascular disease. Women and men differ substantially in terms of prevalence, presentation, management, and outcomes of cardiovascular disease. To date, however, little is known about why cardiovascular disease affects women and men differently. Because many studies do not differentiate the concept of sex and gender, it is sometimes difficult to discriminate sociocultural vs biological contributors that drive observed clinical differences. Female sex has some biological advantages in relation to cardiovascular disease, but many of these advantages seem to disappear as soon as women develop cardiovascular risk factors (eg, type 2 diabetes, hypertension, dyslipidemia). Furthermore, stress and allostatic load could play an important role in the relationship between sex/gender and cardiovascular diseases. In this narrative review, we argue that chronic stress and psychosocial factors might better encompass the patterns of allostatic load increases seen in women, while biological risk factors and unhealthy behaviours might be more important mechanisms that drive increased allostatic load in men. Indeed, men show allostatic load patterns that are more associated with impaired anthropometric, metabolic, and cardiovascular functioning and women have greater dysregulation in neuroendocrine and immune functioning. Thus gender-related factors might contribute to the pathogenesis of cardiovascular disease especially through stress mechanisms. It is important to continue to study the mechanisms by which gender influences chronic stress, because chronic stress could influence modifiable gendered factors to promote cardiovascular disease prevention.

Associations Between Midlife Functional Limitations and Self-Reported Health and Cognitive Status: Results from the 1998-2016 Health and Retirement Study

BACKGROUND

Life-course approaches to identify and help improve modifiable risk factors, particularly in midlife, may mitigate cognitive aging.

OBJECTIVE

We examined how midlife self-rated physical functioning and health may predict cognitive health in older age.

METHODS

We used data from the Health and Retirement Study (1998-2016; unweighted-N = 4,685). We used survey multinomial logistic regression and latent growth curve models to examine how midlife (age 50-64 years) activities of daily living (ADL), physical function, and self-reported health affect cognitive trajectories and cognitive impairment not dementia (CIND) and dementia status 18 years later. Then, we tested for sex and racial/ethnic modifications.

RESULTS

After covariates-adjustment, worse instrumental ADL (IADL) functioning, mobility, and self-reported health were associated with both CIND and dementia. Hispanics were more likely to meet criteria for dementia than non-Hispanic Whites given increasing IADL impairment.

CONCLUSION

Midlife health, activities limitations, and difficulties with mobility are predictive of dementia in later life. Hispanics may be more susceptible to dementia in the presence of midlife IADLs. Assessing midlife physical function and general health with brief questionnaires may be useful for predicting cognitive impairment and dementia in later life.

Physical Disability at Work: How Functional Limitation Affects Perceived Discrimination and Interpersonal Relationships in the Workplace

Adults with disability have significantly lower rates of labor force participation relative to persons without disability, although it is unclear whether this disparity extends to subjective workplace experiences. Using data from the 2004 to 2006 wave of the National Survey of Midlife Development in the United States (n =2,030), we evaluate: (1) whether U.S. workers with physical disability report higher levels of perceived job discrimination and unequal workplace opportunities and lower levels of supervisor and coworker support and (2) whether these patterns differ by sex, age, and occupation group. We find that workers with physical disability fare significantly worse on all four outcomes net of covariates. Disability takes a particularly large toll on men's perceived workplace opportunities and white-collar employees' relationships with coworkers. Young adult workers (ages 30-39) with disability report significantly more support from their supervisor relative to their counterparts without disability. We discuss implications for research and policy.

Life Course Stressors and Functional Limitations in Later Life among White, Black, and Hispanic Adults: Deleterious, Hardening, or Benign?

OBJECTIVES

Although striking racial and ethnic disparities in health are manifest during later life, they may be rooted in early-life exposures. Drawing from cumulative inequality theory, we investigate whether life course stressors are associated with risk of later life functional limitations and whether this relationship differs by race and ethnicity.

METHODS

We utilize longitudinal data from the Health and Retirement Study to test whether child and adult stressors predict trajectories of the occurrence and severity of functional limitations among a diverse sample of older adults.

RESULTS

Child and adult stressors are associated with greater occurrence and severity of functional limitations during later life. Mediation analyses reveal the indirect influence of child stressors via adult stressors on occurrence and severity of functional limitations; however, the indirect effects are slightly stronger for Black and Hispanic adults than their White counterparts.

DISCUSSION

Child stressors, in and of themselves, do not increase functional limitations among Black and Hispanic people but are associated with greater adult stress exposure, predisposing them to more functional limitations. Results suggest that childhood stressors are associated with distinct social pathways to functional limitations among Black, White, and Hispanic older adults.

Inter-Individual Variability in Trajectories of Functional Limitations by Race/Gender

OBJECTIVE

Several theories emphasize that systematic interindividual divergence is a key feature of cohort aging and evidence for accumulative social inequality over the life course. While many have documented widening health gaps with age between subgroups, such divergence is only one aspect of the broader social inequality based on race and gender. This article examines patterns of interindividual variability in trajectories of functional limitations within each race/gender.

METHODS

Using data from the Health and Retirement Study (HRS)'s HRS cohort (born 1931-1941), I estimate growth curves of functional limitations with Level 2 heteroscedasticity, allowing interindividual variability to differ across 4 groups: white men, black men, white women, and black women. I examine race/gender differences in the age-based pattern of interindividual variability using an interquartile range of estimated individual trajectories.

RESULTS

Black men, white women, and black women have greater interindividual variability in functional limitations than do white men. Interindividual variability increases systematically with age at similar rates for all groups but black women.

DISCUSSION

Functional limitations become more heterogeneous with age for the entire cohort and for white men, white women, and black men. Future research should identify life-course processes that generate the race and gender patterning of interindividual variability in late-life health.

Adapting to chronic pain: A focused ethnography of black older adults

This study aimed to understand the coping strategies used by a group of Black older adults to manage chronic pain. To this end, a focused ethnography was completed within a senior housing facility. Following participant observation, 106 residents completed informal interviews and surveys comprised of a demographic tool, the Brief Pain Inventory, the PROMIS Global Health scale, and the Psychological Stress Measure – 9. Further, a subset of 20 participants that reported daily pain completed formal semi-structured interviews, which were recorded and transcribed. Descriptive statistics were completed on survey data while interviews were analyzed contextually and thematically. The adaptive coping strategies used by participants to manage pain included: remaining positive, remaining active, being engaged in the community, prayer/meditation, and maintaining positive support systems. Effective coping strategies lead to compensated levels of adaptation for participants. A middle range schema of pain is presented that may guide future nursing pain management practice.

The Psychological Consequences of Disability over the Life Course: Assessing the Mediating Role of Perceived Interpersonal Discrimination

We examine whether perceived interpersonal discrimination mediates the association between disability and psychological well-being (depression, negative and positive affect) and how these processes differ across the life course. Data are from two waves (2004-2006; 2013-2014) of the Midlife in the United States (MIDUS; N = 2,503). Perceived discrimination accounts for 5% to 8% of the association between disability and the three mental health outcomes. Moderated mediation analyses reveal significant age differences; perceived discrimination is a stronger explanatory mechanism among midlife (ages 40-64) relative to older (age 65+) adults. Disability stigma takes a heightened psychological toll at midlife, a life stage when adults are expected to be able-bodied and interact with a diverse social network, which may be a source of interpersonal mistreatment. Among older adults, for whom impairment is expected and common, the psychological impact of disability may operate through other pathways. We discuss implications for research and practice.

Perceived interpersonal and institutional discrimination among persons with disability in the U.S.: Do patterns differ by age?

RATIONALE

One-third of U.S. adults have an activity-limiting health condition and this proportion increases with age. However, it is unclear whether functional limitation renders one vulnerable to institutional and interpersonal discrimination, and whether this vulnerability differs over the life course. Stigma theories suggest disability would be more discrediting to younger persons relative to older adults, as it violates cultural norms and expectations regarding able-bodied working-age adults.

OBJECTIVE

We evaluate whether U.S. adults with functional impairment report higher levels of perceived interpersonal mistreatment and institutional discrimination relative to persons without impairment, and whether these patterns differ across age groups.

METHOD

We use data from the second wave of the National Survey of Midlife Development in the United States (MIDUS II), collected between 2004 and 2006 (n = 3931). We estimate OLS and logistic regression models to predict interpersonal and institutional discrimination, respectively.

RESULTS

Persons with impairment report more frequent encounters of disrespectful treatment, insults, and being treated as if they have a character flaw, and elevated odds of workplace- and service-related discrimination, net of sociodemographic, and physical and mental health characteristics. Effects are significantly larger among early (age 40-49) and late (age 50-64) midlife versus older (age 65+) adults.

CONCLUSIONS

We discuss implications for policy and practice, and underscore that stigmatization processes may further amplify health and socioeconomic disparities between those with versus without functional limitations.

The weathering hypothesis as an explanation for racial disparities in health: a systematic review

PURPOSE

The weathering hypothesis states that chronic exposure to social and economic disadvantage leads to accelerated decline in physical health outcomes and could partially explain racial disparities in a wide array of health conditions. This systematic review summarizes the literature empirically testing the weathering hypothesis and assesses the quality of the evidence regarding weathering as a determinant of racial disparities in health.

METHODS

Databases (Web of Science, Ovid MEDLINE, PubMed, and Embase) were searched for studies published in English up to July 1, 2017. Studies that tested the weathering hypothesis for any physical health outcome and included at least one socially or economically disadvantaged group (e.g., Blacks) for whom the weathering hypothesis applies were assessed for eligibility. Threats to validity were assessed using the Quality in Prognostic Studies tool.

RESULTS

The 41 included studies were rated as having overall good methodological quality. Most studies found evidence in support of the weathering hypothesis, although the magnitude of support varied by the health outcome and population studied.

CONCLUSIONS

Future evaluations of the weathering hypothesis should include an examination of additional health outcomes and interrogate mechanisms that could link weathering to poor health.