Ethnic Differences in Functional Limitations by Age Across the Adult Life Course

Longitudinal Associations Between Optimism and Objective Measures of Physical Functioning in Women

Importance

Identifying factors contributing to sustained physical functioning is critical for the health and well-being of the aging population, especially as physical functioning may precede and predict subsequent health outcomes. Prior work suggests optimism may protect health, but less is known about the association between optimism and objective physical functioning measures as individuals age.

Objective

To evaluate the longitudinal association between optimism and 3 physical functioning measures.

Design, Setting, and Participants

This was a prospective cohort study using data from the Women's Health Initiative (WHI) with participants recruited from 1993 to 1998 and followed up over 6 years. Data analysis was conducted from January 2022 to July 2022. Participants included postmenopausal women older than 65 years recruited from 40 clinical centers in the US.

Exposure

Optimism was assessed at baseline using the Life Orientation Test-Revised.

Main Outcomes and Measures

Physical functioning was measured at 4 time points across 6 years by study staff evaluating performance in grip strength, timed walk, and chair stands.

Results

The final analytic sample included 5930 women (mean [SD] age, 70 [4] years). Linear mixed-effects models controlling for demographics, depression, health status, and health behaviors showed that higher optimism was associated with higher grip strength (β = 0.36; 95% CI, 0.21-0.50) and number of chair stands (β = 0.05; 95% CI, 0.01-0.10) but not timed walk at baseline. Higher optimism was also associated with slower rates of decline in timed walk (β = -0.09; 95% CI, -0.13 to -0.04) and number of chair stands (β = 0.01; 95% CI, 0-0.03) but not grip strength over time. Cox proportional hazards models showed that higher optimism was associated with lower hazards of reaching clinically defined thresholds of impairment for all 3 outcomes over 6 years of follow-up. For example, in fully adjusted models, for a 1-SD increase in optimism, hazard ratios for reaching impairment thresholds were 0.86 (95% CI, 0.80-0.92) for grip strength, 0.94 (95% CI, 0.88-1.01) for timed walk, and 0.91 (95% CI, 0.85-0.98) for chair stands.

Conclusion and Relevance

In this cohort study of postmenopausal women, at baseline, higher optimism was associated with higher grip strength and number of chair stands but not with the time it took to walk 6 m. Higher optimism at baseline was also associated with maintaining healthier functioning on 2 of the 3 performance measures over time, including less decline in walking speed and in number of chair stands women could perform over 6 years of follow-up. Given experimental studies suggesting that optimism is modifiable, it may be a promising target for interventions to slow age-related declines in physical functioning. Future work should explore associations of optimism with maintenance of physical functioning in diverse populations.

A Decomposition Analysis of Racial Disparities in Physical Activity Among Cancer Survivors: National Health Interview Survey 2009-2018

PURPOSE

In light of the known benefits of physical activity (PA) for cancer survivors, this exploratory study sought to investigate the uptake of PA among this population in the United States.

METHODS

Using the National Health Interview Survey data from 2009 to 2018, lung, breast, colorectal, prostate, ovarian, and lymphoma cancer survivors were identified, and their PA adherence measured per the standards of the American College of Sports Medicine. Logistic regression and the Fairlie decomposition were used, respectively, to identify correlates of PA and to explain the difference in PA adherence between races.

RESULTS

Uptake of PA was significantly different between Whites and minorities. Blacks had lower odds than Whites (adjusted odds ratio: 0.77; 95% confidence interval, 0.66-0.93), whereas Mixed Race had twice the odds of Whites (adjusted odds ratio: 1.94; 95% confidence interval, 0.27-0.98) of adhering to PA recommendations. Decomposition identified education, family income-to-poverty ratio, body mass index, number of chronic conditions, alcohol use, and general health as key factors accounting for the PA disparity between cancer survivors of White and Black or Multiple/Mixed racial group.

CONCLUSION

These findings could help inform behavioral PA interventions to improve their design and targeting to different racial groups of cancer survivors.

Plasma biomarkers predict cognitive trajectories in an ethnoracially and clinically diverse cohort: Mediation with hippocampal volume

Introduction

We examine whether the association between key plasma biomarkers (amyloid β [aβ] 42/40, total tau (t-tau), neurofilament light [NfL]) and cognitive trajectories (executive function [EF] and episodic memory [EM]) is mediated through neurodegeneration.

Methods

All participants were recruited from the University of California, Davis-Alzheimer's Disease Research Center (n = 473; baseline age range = 49-95 years, 60% women). We applied an accelerated longitudinal design to test latent growth models for EF and EM, and path and mediation analyses. Age was centered at 75 years, and all models were adjusted for sex, education, and ethnicity.

Results

HV differentially mediated the association aβ 42/40 and NfL on EF and EM level and change. Hippocampal volume (HV) did not mediate the association between t-tau and cognitive performance.

Discussion

Neurodegeneration as represented with HV selectively mediates the association between key non-invasive plasma biomarkers and cognitive trajectories in an ethnoracially and clinically diverse community-based sample.

Prevalence and Social Risk Factors of Functional Limitations Among Slum-Dwelling Older Adults: Findings From the Nairobi Urban Health and Demographic Surveillance System

Objective: In this study, we investigate the patterns and the risk factors of functional limitations in a sample of 1323 slum-dwelling older adults in Kenya who participated in the Nairobi Urban Health and Demographic Surveillance Systems. Methods: We conducted crude and adjusted logistic regression analyses to evaluate the associations. Results: The prevalence of activities of daily living (ADL) and instrumental ADL (IADL) limitations were approximately 5% and 8%, respectively; some 4.5% reported both limitations. Estimates varied significantly between sexes and age (p < .001). After adjustments, age, female, and Garre ethnic group were associated with ADL and IADL limitations. ADL decline was determined by co-residence (aOR = 0.93, 95% CI = 0.34-0.95), household size (aOR = 1.19, 95% CI = 1.04-1.37) and educational level (aOR = 0.45, 95% CI = 0.05-0.72). Conclusions: Older slum-dwellers in Nairobi experience functional impairments with marked age and sex differences. These findings may encourage salient policy planning and public health interventions to promote healthy aging in informal settlements.

Ethnic differences in functional limitations: a comparison of older migrants and native Dutch older population

Background

Although the older migrants population in Europe is expected to grow substantially in the coming years, there is little information about their health status and particularly functional limitations. This study examined the association of ethnicity and mobility, hearing and visual limitations in comparison to the general population in the Netherlands, and whether relevant characteristics explained the potential differences between older migrants and non-migrants.

Methods

Secondary data analysis of 12 652 subjects 55 years and older who participated in the health survey in the four largest Dutch cities. To establish limitations in vision, hearing and mobility, the Organization for Economic Co-operation and Development (OECD) questionnaire was used. Logistic regression analysis was used to examine the association between limitations and ethnic background, subsequently adjusting for demographic and socio-economic characteristics and relevant health- and lifestyle-related factors.

Results

Older migrants had higher prevalences of functional limitations. The age- and- gender adjusted ORs were 2 to 8-fold compared with older non-migrants. After adjusting for socioeconomic status and health-and lifestyle indicators, Moroccan, Turkish and Surinamese migrants still had increased ORs for visual limitations [ORs (95% CI), respectively: 2.48 (1.49–4.14), 3.08 (1.75–5.41) and 1.97 (1.33–2.91)] compared with the Dutch. For mobility limitations, only the Turkish migrants had an OR twice as high (2.19; 1.08–4.44) as the non-migrants. No significant differences were found between Antillean/Aruban migrants and non-migrants.

Conclusions

Important ethnic inequalities exist in various functional limitations, particularly in vision. These results underline the importance of tailored preventive interventions in older migrants to detect and prevent these limitations at an early stage.