Association of mental demands in the workplace with cognitive function in older adults at increased risk for dementia

The dual impact of education and occupation on cognitive functioning in older Mexican adults: A cross-sectional exploratory study

This research investigated the relationship between cognitive performance and an individual's educational attainment as well as occupational mental demands among Mexican adults aged 50 or older. We hypothesized that cognitively demanding work boosts cognitive performance for older adults regardless of their education level. To test our hypothesis, we analyzed data on 12,939 individuals in the 2012 Mexican Health and Aging Study using a Generalized Linear Model with a Gaussian family and identity link function. We assessed cognitive demands of occupations with the National Information Network's descriptors, focusing on worker-oriented and job-oriented mental demands. We found that greater worker-oriented (β = 0.5; CI = 0.45, 0.55) and job-oriented (β = 0.49; CI = 0.45, 0.53) mental demands predicted better cognitive performance. Educational attainment correlated even more strongly with better cognitive performance (β = 0.9; CI = 0.87, 0.92). Both our models showed a statistically significant negative interaction between medium occupational mental demands and medium education level (job-oriented: β = -0.09; CI = -0.14, -0.05; worker-oriented: β = -0.07; CI = -0.12, -0.02). Other interaction terms were not significant. This study highlighted a significant effect of educational attainment on cognitive function, which is more pronounced than that of occupational mental demands. The association of higher occupational mental demands with higher cognitive function appeared to be largely independent of educational background. The similarity in cognitive scores using worker-oriented or job-oriented metrics suggests that both are useful for assessing occupational mental demands. Education and cognitive engagement at work are crucial for promoting cognitive health in aging populations.

Physical and mental demands of work associated with dementia risk in later life

BACKGROUND

Work occupies a significant portion of adult life, and both cognitive stimulation and physical activity have been suggested as factors that may lower dementia risk in later life.

OBJECTIVES

To examine the association between mental and physical demands at work and the risk of dementia.

DESIGN

A cohort study.

SETTING

Seven selected districts in Taiwan, covering both urban and rural areas.

PARTICIPANTS

4,083 community-dwelling healthy adults aged 55 and older from the Healthy Aging Longitudinal Study.

MEASUREMENTS

A job matrix of work conditions by occupation was generated using data from a representative national survey. Mental demands were assessed by job control and psychological demands from the Job Content Questionnaire, as well as skill levels. Physical demands were assessed using a 4-point Likert scale and dichotomized into high and low levels. Dementia diagnoses were identified based on physician diagnosis registered in the National Health Insurance database.

RESULTS

Over a follow-up period of 6.2 years, 513 participants were diagnosed with dementia. After adjusting for confounding factors in cox regression models, high (vs. low) job control, high -skilled jobs (vs. low), and high physical demands (vs. low) were associated with a reduced future risk of dementia. Psychological demands were not associated with dementia risk.

CONCLUSIONS

Greater utilization of job skills and engagement in physically demanding activities at work may help mitigate the risk of developing dementia. The effects of different dimensions of psychological demands on cognitive health warrant further investigation.

The association between employment and cognitive function in older adults: A systematic review

The number of working older adults has been increasing in the past decade. Past studies have shown that working has a beneficiary effect on the health of older adults. One of the functions that older adults want to maintain is cognitive function, as this function is essential for an independent and high quality of life. Meanwhile, the association between employment >60 years and cognitive function has not yet been organized. In this study, a systematic review was conducted to clarify the longitudinal association between working older adults and cognitive function. A computerized search was performed using PubMed, CINHAL, and PsycINFO for prospective studies published until July 2023. Of the 76 174 studies identified, six were included in the systematic review based on the inclusion and exclusion criteria. Four studies were from Asian countries (one from Taiwan and three from Japan), and two from the USA. Of the six studies, five reported an association between employment later in life and a lower risk of cognitive decline. Three studies examined the association by performing gender-specific analyses, reporting varied results. Overall, the results of this review suggest that the employment of older adults was positively associated with cognitive function over time. Geriatr Gerontol Int 2024; 24: 1283-1291.

Association of nature of work and work-related characteristics with cognitive functioning, life satisfaction and depression among Indian ageing adults

BACKGROUND

Most individuals spend a significant amount of their time at work, and the dynamics at work can potentially influence their overall life, especially health and mental health. The present study tried to understand the association of the nature of work categorized as physically demanding, psychologically demanding, and environmentally hazardous on life satisfaction, cognitive functioning, and depressive symptoms among working middle-aged and older adults in India.

METHOD

We used data from the Longitudinal Ageing Study in India (LASI), Wave 1, collected between 2017 and 2018. The study sample consists of 28,653 working adults aged between 45 and 70. The study measures were assessed using standard tools. Linear regression analysis was employed.

RESULTS

The results indicate that individuals working in less physically demanding (β = 0.06, 99% CI = 0.02-0.09) and not hazardous environments (β = 0.15, 99% CI = 0.09-0.20) had better life satisfaction. Also, not being involved in hazardous work environments increased the likelihood of good cognitive functioning and reduced depressive symptoms (β= -0.17, 99% CI= -0.20- -0.15). However, samples involved in works requiring less psychological demand had an increased likelihood of reduced life satisfaction and increased depressive symptoms.

CONCLUSION

This study's results highlight the importance of creating a conducive working environment for the ageing adults.

CAIDE Score, Alzheimer's Disease Pathology, and Cognition in Cognitively Normal Adults: The CABLE Study

Background

Cardiovascular Risk Factors, Ageing and Dementia (CAIDE) risk score serves as a credible predictor of an individual's risk of dementia. However, studies on the link of the CAIDE score to Alzheimer's disease (AD) pathology are scarce.

Objective

To explore the links of CAIDE score to cerebrospinal fluid (CSF) biomarkers of AD as well as to cognitive performance.

Methods

In the Chinese Alzheimer's Biomarker and LifestylE (CABLE) study, we recruited 600 cognitively normal participants. Correlations between the CAIDE score and CSF biomarkers of AD as well as cognitive performance were probed through multiple linear regression models. Whether the correlation between CAIDE score and cognitive performance was mediated by AD pathology was researched by means of mediation analyses.

Results

Linear regression analyses illustrated that CAIDE score was positively associated with tau-related biomarkers, including pTau (p < 0.001), tTau (p < 0.001), as well as tTau/Aβ42 (p = 0.008), while it was in negative association with cognitive scores, consisting of MMSE score (p < 0.001) as well as MoCA score (p < 0.001). The correlation from CAIDE score to cognitive scores was in part mediated by tau pathology, with a mediation rate varying from 3.2% to 13.2%.

Conclusions

A higher CAIDE score, as demonstrated in our study, was linked to more severe tau pathology and poorer cognitive performance, and tau pathology mediated the link of CAIDE score to cognitive performance. Increased dementia risk will lead to cognitive decline through aggravating neurodegeneration.

Loneliness in Older Indian Dyads

BACKGROUND

Loneliness has been recognised as a major public health concern in older adults in developed nations, with little focus on low- and middle-income countries such as India. While the protective nature of social relationships on loneliness has been explored in the context of marriage, typically these benefits are examined in individual spouses rather than within the marital dyad.

METHODS

A sample of 398 opposite-sex married Indian couples (mean age 54.8 years) was obtained from the pilot wave of the Longitudinal Aging Study in India (LASI) conducted in 2010. These cross-sectional data were analysed using the Actor-Partner Interdependence Model, with one's own and one's partner's cognitive function, functional limitations, depressive symptoms, employment status and contact with friends included as predictors of loneliness.

RESULTS

There were no gender differences in the pattern of associations. Depression was positively associated with loneliness with actor and partner effects being significant. One's partner being employed was associated with less loneliness.

CONCLUSIONS

The sample showed low levels of depression, loneliness, and reduced functionality; however, depression still predicted one's own and one's partner's loneliness. Future work using longitudinal data could examine the role of employment in loneliness, particularly within the context of gender roles.