Latent cognitive profiles and their associations with instrumental activities of daily living among older adults without dementia: A United States national cross-sectional study

BACKGROUND

Conventional dichotomous classifications of cognitive status in older adults (normal vs impaired) may obscure distinct domain-specific deficits. Identifying nuanced cognitive profiles could enable personalized interventions, particularly when tailored to instrumental activities of daily living (IADLs).

OBJECTIVES

To identify distinct cognitive profiles in older adults without dementia and assess their associations with overall and domain-specific IADL performance.

DESIGN/SETTING/PARTICIPANTS

Cross-sectional data from 2219 adults aged ≥65 years without dementia in the nationally representative National Health and Aging Trends Study.

MEASUREMENTS

Latent profile analysis classified participants across six cognitive domains: episodic memory, executive function, orientation, psychomotor function, visual attention, and working memory. Logistic and linear regression models with Holm-Bonferroni corrections evaluated relationships between cognitive profiles and IADL performance.

RESULTS

Five profiles emerged: Profile 1: Overall intact (50.5 % of participants); Profile 2: Isolated moderate orientation impairment (15.6 %); Profile 3: Mild global impairment with preserved orientation (22.0 %); Profile 4: Mild global impairment with significant orientation impairment (5.5 %); Profile 5: Moderate global impairment (6.2 %). Compared with Profile 1, all other profiles exhibited significantly higher overall IADL difficulty and were more likely to experience challenges with shopping, medication management, meal preparation, and banking (all adjusted p < 0.05). Profile 4 had the highest odds for difficulties with shopping (OR, 2.19; 95 % CI, 1.41-3.38; adjusted p = 0.005) and banking (OR, 3.98; 95 % CI, 2.62-6.04; adjusted p < 0.001), whereas Profile 5 showed the greatest risk for medication management (OR, 2.55; 95 % CI, 1.66-3.90; adjusted p < 0.001) and meal preparation (OR, 2.22; 95 % CI, 1.49-3.31; adjusted p = 0.001).

CONCLUSION

Nearly half of older adults without dementia exhibit distinct cognitive profiles warranting tailored interventions. Profile 5 requires comprehensive strategies, whereas Profiles 2, 3, and 4 may benefit from orientation-targeted and intensity-varied training in other cognition domain. Incorporating specific IADL tasks (e.g., meal preparation, medication management for Profile 5 and shopping, banking for Profile 4) into cognitive interventions may concurrently enhance cognitive health and functional independence.

Network Analysis of Key Instrumental Activities of Daily Living and Cognitive Domains for Targeted Intervention in US Older Adults Without Dementia: Cross-Sectional Study

Background

Cognitive impairment in older adults reduces independence and raises health care costs but can be mitigated through stimulating activities. Based on network theory, intricate relationships within and between clusters of instrumental activities of daily living (IADLs) and cognitive domains suggest the existence of central IADLs and cognitive domains, as well as bridge IADLs. Modifying these can significantly enhance daily living activities and cognitive functions holistically.

Objective

This study aims to identify central IADLs (key activities within the IADL network), central cognitive domains (key domains within the cognitive network), and bridge IADLs (linking IADL and cognitive networks). These insights will inform targeted interventions to effectively improve IADL and cognitive well-being in older adults.

Methods

A cross-sectional analysis of adults aged 65 years and older in the United States focused on 5 IADLs and 6 cognitive domains from the National Health and Aging Trends Study (NHATS). Network analysis identified central and bridge variables. Nonparametric and case-dropping bootstrap methods checked network stability. Network comparison tests assessed sex differences with Benjamini-Hochberg adjustments.

Results

Of the 2239 participants, 56.4% were female (n=976). We computed and tested 3 networks: IADL, cognition, and bridge-with correlation stability coefficients of 0.67, 0.75, and 0.44, respectively (all>0.25). Meal preparation was identified as the central IADL, with a centrality index of 3.87, which was significantly higher than that of other IADLs (all P<.05). Visual attention emerged as the central cognition domain, with a centrality index of 0.86, which was significantly higher than that of other cognition domains (all P<.05). Shopping was determined to be the bridge IADL, with a centrality index of 0.41, which was significantly higher than that of other IADLs (all P<.05). Notably, gender differences emerged in the IADL network, with stronger associations between laundry and meal preparation in females (1.69 vs males: 0.74; P=.001) and higher centrality in meal preparation among females (difference=1.99; P=.007).

Conclusions

While broad enhancements in all IADL and cognitive domains are beneficial, targeting meal preparation, visual attention, and shopping may leverage their within-network influence to yield a more pronounced improvement in holistic IADL, holistic cognition, and holistic cognition function through IADL interventions among older adults. Notably, meal preparation interventions may be less effective in males, requiring tailored approaches.

Exploring Dual-Task Performance Relationships for Veterans with Lower-Limb Amputation

Adults with lower-limb (LL) amputation have difficulty dual-tasking which may elicit falls and is required for instrumental activities of daily living (IADLs). The purpose of this study was to explore the relationships between dual-task performance, falls, and IADLs for Veterans with LL amputation. A cross-sectional study was completed with dual-task performance, retrospective fall reporting, and participation in IADLs. Dual-task performance varied across participants (n = 24) and although it was not significantly correlated to IADL participation, the relationships between dual-tasking, falls, and IADLs warrants further study to maximize dual-task training that can translate to everyday life.

Effects of a dual intervention (motor and virtual reality-based cognitive) on cognition in patients with mild cognitive impairment: a single-blind, randomized controlled trial

BACKGROUND

The increase in cases of mild cognitive impairment (MCI) underlines the urgency of finding effective methods to slow its progression. Given the limited effectiveness of current pharmacological options to prevent or treat the early stages of this deterioration, non-pharmacological alternatives are especially relevant.

OBJECTIVE

To assess the effectiveness of a cognitive-motor intervention based on immersive virtual reality (VR) that simulates an activity of daily living (ADL) on cognitive functions and its impact on depression and the ability to perform such activities in patients with MCI.

METHODS

Thirty-four older adults (men, women) with MCI were randomized to the experimental group (n = 17; 75.41 ± 5.76) or control (n = 17; 77.35 ± 6.75) group. Both groups received motor training, through aerobic, balance and resistance activities in group. Subsequently, the experimental group received cognitive training based on VR, while the control group received traditional cognitive training. Cognitive functions, depression, and the ability to perform activities of daily living (ADLs) were assessed using the Spanish versions of the Montreal Cognitive Assessment (MoCA-S), the Short Geriatric Depression Scale (SGDS-S), and the of Instrumental Activities of Daily Living (IADL-S) before and after 6-week intervention (a total of twelve 40-minutes sessions).

RESULTS

Between groups comparison did not reveal significant differences in either cognitive function or geriatric depression. The intragroup effect of cognitive function and geriatric depression was significant in both groups (p < 0.001), with large effect sizes. There was no statistically significant improvement in any of the groups when evaluating their performance in ADLs (control, p = 0.28; experimental, p = 0.46) as expected. The completion rate in the experimental group was higher (82.35%) compared to the control group (70.59%). Likewise, participants in the experimental group reached a higher level of difficulty in the application and needed less time to complete the task at each level.

CONCLUSIONS

The application of a dual intervention, through motor training prior to a cognitive task based on Immersive VR was shown to be a beneficial non-pharmacological strategy to improve cognitive functions and reduce depression in patients with MCI. Similarly, the control group benefited from such dual intervention with statistically significant improvements.

TRIAL REGISTRATION

ClinicalTrials.gov NCT06313931; https://clinicaltrials.gov/study/NCT06313931 .

Separating the Effects of Transitions Into and Out of Social Isolation and Loneliness on Cognitive Function in Later Life

OBJECTIVES

This study investigates the effects of social isolation and loneliness on cognitive function, distinguishing between the effects of transitioning into and out of these states.

METHODS

This study analyzed data from 6,663 adults aged 65 or older collected over the course of 7 waves (12 years) of the Korean Longitudinal Study of Aging from 2006 to 2018. A novel asymmetric fixed effects model was utilized to separately estimate the effects of transitions into and out of social isolation or loneliness.

RESULTS

The association of transitions into social isolation due to a lack of informal social contact or loneliness with cognitive function (b = -1.387, p < .001 and b = -0.601, p < .001, respectively) was stronger than the association of transitions out of these states (b = 0.345, p < .05 and b = 0.353, p < .001, respectively). The magnitude of the negative and positive coefficients was statistically different (F-statistic = 45.29, p < .001 and F-statistic = 5.12, p < .05, respectively). In contrast, no such asymmetric effects were observed for social isolation due to a lack of formal activity (F-statistic = 0.06, p = .800).

DISCUSSION

The detrimental effects of transitioning into social isolation due to a lack of informal social contact (but not formal activity) or loneliness on cognitive function outweigh the beneficial effects of transitioning out of these states. Preventing the onset of social disconnection should be prioritized as an intervention to improve the cognitive function of older adults.

A Semantic-Based Cognitive Training Programme on Everyday Activities: A Feasibility and Acceptability Study among Cognitively Healthy Older Adults

Background

During the normal ageing process, a person's cognitive functions and memory gradually decline, which can affect their ability to perform everyday activities including cooking, cleaning, managing finances, and shopping. Semantic memory encoding strategies benefit older adults' cognitive and functional performance. Such strategies can be taught by an accessible, cost-effective, and flexible app-based programme. Currently, no studies examine such an app-based programme focussed on everyday activities.

Objectives

To determine if an app-based programme constructed on the principles of semantic memory encoding strategies, targeted towards older adults, called Enhancing Memory in Daily Life (E-MinD Life) is (1) feasible by examining acceptance, engagement, and attendance and (2) acceptable by examining the perceived effectiveness, relevancy, clarity, and convenience.

Methods

Eleven participants were recruited to a nine-week (18 sessions) programme using E-MinD Life. Feasibility was measured by collecting data on recruitment and retention rates, attendance, and duration of sessions. Acceptability was measured via a Likert scale questionnaire and free comments. Likert scale responses were analysed using descriptive statistics; open-ended responses were categorised qualitatively via constant comparative approach.

Results

Nine participants completed the programme. Overall, most participants found the programme relevant, convenient, logical, and easy to understand and perceived it to be effective to address functional cognitive problems impacting performance of everyday activities. The results from the qualitative analysis showed that participants found the programme enjoyable and the interaction with the research team throughout the intervention beneficial.

Conclusion

E-MinD Life shows promise as the focus of further research to determine the effectiveness of the programme and sematic-based cognitive strategies in maintaining cognition and performance in everyday activities among older adults with and without cognitive impairment.

The feasibility and acceptability of an app-based cognitive strategy training programme for older people

BACKGROUND

Increasing numbers of people are living with mild cognitive impairment in later life and seeking therapy to maintain cognition to remain as independent as possible in daily life. Based on a review of the literature, an app-based programme using perceptual-encoding strategies called Enhancing Memory in Daily Life (E-MinD Life) was developed. An expert panel reviewed the programme's appropriateness for older people with and without mild cognitive impairment. As part of the design process, the feasibility and acceptability of the E-MinD Life programme were then assessed in relation to its use by healthy older adults, with findings informing the application of the programme to older people with mild cognitive impairment in the future.

METHODS

Phase 1: The E-MinD Life programme was reviewed by an expert panel of occupational therapists. Experts rated the programme on a Likert scale and answered open-ended questions in relation to feasibility, clarity, and relevancy. Phase 2 involved field-testing the 9-week programme with a sample of nine healthy older people. Participants rated the acceptability of the programme on a Likert scale questionnaire. Data on recruitment rates and retention, and adherence and duration of sessions were collected to determine the feasibility of the programme. Responses to the Likert scale were analysed using descriptive statistics. Open-ended responses were categorised qualitatively using a constant comparative approach.

RESULTS

Phase 1: Experts indicated that the E-MinD Life programme was feasible and included relevant activities for community living. Although experts felt that an older user with mild NCD would be able to independently complete the programme, the qualitative analysis suggests formatting changes in future iterations of the programme to enhance visual clarity. Phase 2: All participants completed the 9-week programme. The average number of self-administered sessions attempted over the 9-week period was 13.44 (SD = 6.73) out of 18 scheduled sessions. Overall, most participants found the programme relevant, logical and easy to understand, and perceived it to be effective for functional cognitive problems.

CONCLUSION

The E-MinD Life programme shows promise for inclusion into trial designs to determine the effectiveness of the cognitive strategy programme for older people with and without cognitive impairment.

TRIAL REGISTRATION

ClinicalTrials.gov, NCT03430401. Registered 1 February 2018.

Assessing Older Adults' Decision-Making Capacity for Independent Living: Practice Tensions and Complexities

Decision-making capacity (DMC) is a salient issue due to increasing ageing populations and associated dementia-related diseases. Legislative and policy developments emphasise older adults' rights to participate in decision-making. Fifty-two occupational therapists working with older adults from a range of practice settings in Ireland participated in focus groups to discuss their contribution to multidisciplinary assessments of older adult's DMC for independent living. Findings indicate lack of shared understanding of DMC and conflicting philosophies of practice and highlight the need for a comprehensive and multidisciplinary approach. Findings also highlight that older people are often excluded from care-planning, and independent living options are determined by availability of community services rather than their preferences. Future research will attempt to inform practice in assessing and supporting older adults' DMC for independent living.

The Relationship between Cognitive Status and Retained Activity Participation among Community-Dwelling Older Adults

Identifying retained activity participation to old age can improve age-related changes in balance and cognition function. Subjects ≥ 60 years were enrolled in this study. Balance and Cognitive function include working memory, executive function, and sustained and divided attention was evaluated with “Fullerton advanced balance”, “n-back”, “Wisconsin card sort”, “sustain and divided attention test”, respectively. In addition, retained activity participation was measured using the Activity Card Sort questionnaire. The univariate and multivariate regression analyses of different domains of retained activity participation were used as independent variables, including instrumental activity, low-effort leisure, high-effort leisure, and social activity on balance and specific domains of cognition. Seventy-seven subjects (65.3 ± 4.4 years, 61% female) were included. About 47% of older adults had a college education, 32.3% had a diploma, and 20.7% had elementary−middle education. These results show that retained instrumental activity had a relationship with working memory (β = 0.079, p < 0.05). In addition, we found that retained high-effort leisure activity can increase balance, divided attention, and executive function score (β = 0.1, β = 0.05, β = 0.02, p < 0.05). Moreover, there was a positive relationship between retained low-effort activity and sustained attention (β = 0.08, p < 0.05). In addition, the coefficient of determination (R2) for balance, working memory, executive function, sustained, and divided attention were 0.45, 0.25, 0.13, 0.11 and 0.18, respectively. The study suggests that retained activity participation types may have various effects on balance and some selective cognitive components in older people.

The Impact of Cognitive impairment on Clinical Symptoms, Physical Activity and Care Interactions among Residents in Assisted Living Settings

The purpose of this study was to describe differences in pain, behavioral symptoms, quality of staff-resident interactions, participation in function focused care and physical activity among residents with and without cognitive impairment in assisted living. This was a secondary data analysis using baseline data from an ongoing trial testing Function Focused Care for Assisted Living using the Evidence Integration Triangle (FFC-AL-EIT). A total of 550 residents were recruited from 59 communities. The average age of participants was 89.30 (SD = 7.63), the majority were white (98%), female (69%), had evidence of cognitive impairment (75%), and 5.16 (SD = 1.86) comorbidities. Those with cognitive impairment had more pain, were more sedentary and less likely to engage in function focused care activities. Addressing pain and implementing interventions for those with cognitive impairment to participate in function focused care may help optimize function and physical activity in assisted living residents.