Psychological Well-Being and Cognitive Function among Older Adults in China: A Population-Based Longitudinal Study

Gender differences in the mediating effects of social participation and number of children on psychological resilience and cognitive function in older adults

The aim of this study is to explore the relationship between the number of children of older adults in China and their cognitive function. A total of 15862 older adults were included in the 2017-2018 China Health and Longevity Longitudinal Survey(CLHLS), and were explored using Structural Equation Modeling(SEM) and restricted cubic splines(RCS). Research has found that social participation and psychological resilience have a moderating effect on the impact of child numbers on cognitive function, with a greater impact observed in female participants. RCS shows a U-shaped relationship between the number of children and poorer cognitive outcomes, but low fertility rates are only associated with poorer cognitive function in women. Cognitive function decreases with decreasing social participation and psychological resilience. To combat cognitive decline in older adults with multiple children, it is imperative to take into account the societal and psychological impacts and to integrate a suite of complementary intervention strategies.

Loneliness partially mediates the relationship between Internet access and cognitive function in late adulthood: A cross-lagged panel analysis

OBJECTIVE

Previous studies have shown an association between Internet access and cognitive function, and have also found that loneliness is a precursor to cognitive impairment. However, little is known about the bidirectional relationship between Internet access and cognitive function, and the potential mechanisms that underlie these three variables. This study examined the reciprocal relationship between Internet access and cognitive function, as well as the mediating role of loneliness among middle-aged and older Chinese adults.

METHODS

Data were derived from four waves (2011, 2013, 2015, and 2018) of the China Health and Retirement Longitudinal Study. A total of 6578 participants aged 50 and above with complete cognitive test data at baseline were selected for the analysis. Cross-lagged panel models were applied to explore the relationship between Internet access and cognitive function, with attention to the mediating role of loneliness.

RESULTS

Reciprocal 4-wave lagged associations between Internet access and cognitive function, and the partial mediating role of loneliness were found in this study, controlling for all covariates. Increased Internet access predicts better cognitive function over time, and vice versa. Notably, this association was partially mediated by loneliness, indicating that more Internet access was associated with reduced loneliness, which was then associated with better cognitive performance.

CONCLUSIONS

This suggests that Internet access can influence individuals' cognitive function by impacting their feelings of loneliness. Multidisciplinary interventions utilizing digital connections to alleviate loneliness, enhance cognitive resilience, and delay cognitive decline may thus contribute to healthier aging in the digital era.

The Healthy Caregiver? A Positive Impact of Informal Caregiving Status on Cognitive Functions Over Time From the Midlife in the United States Study

OBJECTIVES

The current study examined whether informal caregivers performed worse, better, or similar to non-caregivers on cognitive tests of executive functioning and episodic memory over 10 years. Methods: Data were from waves 2 (2003-04) and 3 (2013-14) of the Midlife in the United States (MIDUS) study (N = 2086). Multiple linear regression models examined whether caregiving at both waves 2 and 3 predicted better cognitive functioning at wave 3, than caregiving at only one time point or no caregiving (reference) while controlling for baseline covariates (i.e., sociodemographic, health, and functional status).

RESULTS

After controlling for covariates, caregiving at both waves was independently associated with better performance in episodic memory (b = .24, SE = .10, p = .013) but not executive function (b = -.06, SE = .05, p = .246). Discussion:The findings partially supported both healthy caregiver and stress process models, indicating caregiving may be associated with better episodic memory but not executive functioning over time among the middle-aged and older adults.

Psychosocial Well-Being Differences Between the Young Old, Old-Old, and Oldest Old: A Global Comparison

OBJECTIVES

We investigate global differences in psychosocial well-being between older adult age groups.

METHODS

Using multinomial logistic regression, we analyzed 2018 data (n = 93,663) from 9 countries/regions in the Health and Retirement Study international family of studies to compare age group differences in depression, loneliness, and happiness.

RESULTS

Compared to the young old, the old-old reported more depression in Southern Europe, while the oldest old had higher risk in India and Southern Europe but lower risk in the United States. The old-old reported less loneliness in the United States but more in Southern Europe, while the oldest old had greater risk in Southern Europe. The old-old reported less happiness in Korea, while the oldest old had lower reports in Korea but higher reports in the United States.

DISCUSSION

The psychosocial well-being of the oldest old is exceptionally good in the United States but exceptionally poor in Southern Europe.

Mathematical problem solving is modulated by word priming

This study aimed to explore the influence of word priming on mathematical problem solving. In two experiments, participants were required to finish multiplication estimation tasks with a specified estimation strategy under different word priming conditions (Experiment 1: concrete words vs. Experiment 2: abstract words). The results showed that: (1) under the concrete word priming condition, in comparison to neutral, positive word priming improved accuracies (ACCs) when using a down-up strategy (e.g., doing 40 × 80 = 3200 for 43 × 78), while both positive and negative word priming reduced reaction time (RT); (2) under the abstract word priming condition, both positive and negative (vs. neutral) abstract word priming reduced RTs, while individuals' ACCs of completing the estimation task were not influenced by valence. The present study showed that whether concrete words or abstract words were adopted as experimental stimuli, participants' performance of completing mathematical problems was modulated by the valence of the priming word, which led us to develop a better understanding of how arithmetic performance is influenced by word processing.

Association between cognitive dysfunction and diabetes in patients over 65 years old: a cross-sectional study using propensity score matching

OBJECTIVES

To investigate the association between diabetes and cognitive dysfunction in the elderly population, and examine the impact of cognitive dysfunction on level of activities of daily living (ADL) in patients with diabetes.

METHODS

Data analysis was conducted on 2,951 individuals aged over 65 years from the Chinese Longitudinal Healthy Longevity Survey cohort. Propensity score matching was utilized to mitigate selection bias. Multivariate binary logistic regression was performed to analyse the association between diabetes and cognitive dysfunction in the study subjects. In addition, the relationship between ADL and cognitive function in patients with diabetes was analysed using the Wilcoxon rank-sum test.

RESULTS

A significant association (p = 0.017) was found between diabetes and the occurrence of cognitive dysfunction in older adults. Subgroup analyses revealed that diabetes patients with cognitive dysfunction exhibited a worse ADL dependence compared with those without cognitive dysfunction (p < 0.001).

CONCLUSION

These findings indicate that diabetes is associated with cognitive dysfunction in older adults. Meanwhile, there is an association between cognitive impairment and ADL level in subjects with diabetes. As such, healthcare professionals should pay close attention to the occurrence of cognitive dysfunction and ADL decline during diagnosis and treatment, and proactive prevention and intervention strategies should be implemented.

Cognitive Function, and Its Relationships with Comorbidities, Physical Activity, and Muscular Strength in Korean Older Adults

Background: Little is known regarding how much physical activity (PA) and lower-body muscle strength (LBMS) together can help to reduce the negative effect of comorbidities on cognitive function. This study examined the moderating effects of PA and LBMS in determining the relationship between comorbidities and cognitive function in older Korean adults. Materials and Methods: This is a population-based cross-sectional study. Data for this study were taken from the 2020 Korea Longitudinal Study on Aging (KLoSA) in South Korea using a computer-assisted personal interview. The 2020 KLoSA survey included a total of 10,097 older individuals aged 65 and older (6062 females and 4035 men). Comorbidities were determined based on physician-diagnosed chronic conditions. PA and LBMS were measured with a self-reported questionnaire and a sit-to-stand test, respectively. Cognitive function was assessed using the Korean version of the Mini-Mental Status Examination for dementia screening. Results: Multimorbidity was correlated with an increased risk (odds ratio, OR = 1.415, p < 0.001) of cognitive impairment. Insufficient PA and weak LBMS were correlated with an increased risk of cognitive impairment (OR = 1.340, p < 0.001; OR = 1.719, p < 0.001, respectively). Particularly, PA modulates the negative impact of comorbidities on cognitive function (β = −0.3833; 95% CI = −0.4743 to −0.2023) independent of all measured covariates. Weak LBMS was found to be an independent predictor of cognitive function (β = −2.5078, p < 0.001) regardless of comorbidities. Conclusions: The study findings suggest that a lifestyle intervention targeting regular PA and muscular fitness should be a therapeutic means against cognitive decline associated with normal aging and/or chronic diseases.