Alzheimer Disease
Conditions
Keywords
Risk reduction, Community, Older adults, Lifestyle modification
Brief summary
Investigators aimed to examine the feasibility and effectiveness of a multidomain intervention strategy involving intensive and maintenance programs aimed at reducing the risk of Alzheimer's disease (AD) in at-risk older adults. Participants were randomly allocated into three groups: (1) intensive plus maintenance program (INT+MNT group), (2) intensive program only (INT-only group), and (3) active control (control group). There were two study hypotheses: 1) the participants in the 4-week intensive program (INT+MNT and INT-only group) would show reduced dementia risk scores compared to control; and 2) that the participants in the added 20-week maintenance program (INT+MNT group) would show greater improvement in dementia risk scores compared to the INT-only and control groups.
Detailed description
OBJECTIVES: To examine the feasibility and effectiveness of a multidomain intervention strategy involving intensive and maintenance programs aimed at reducing the risk of Alzheimer's disease (AD) in at-risk older adults. DESIGN: A prospective randomized controlled trial with participants assigned to three parallel programs: intensive plus maintenance (INT+MNT), intensive only (INT-only), and active control. SETTING: A community center for dementia in South Korea. PARTICIPANTS: Community-dwelling older adults (aged ≥ 60 years) without dementia, but having several risk factors for AD. MEASUREMENTS: The study subjects participated in a 4-week intensive group-based lifestyle modification program that focused on physical activity, vascular risk factors, dietary habits, cognitive activities, and social engagement. Then, the participants underwent a 20-week maintenance program to consolidate modified habits. Linear mixed models were used to examine the changes in modified Australian National University-Alzheimer's Disease Risk Index (ANU-ADRI) scores in each group. Additional analyses of secondary outcomes, including cognitive function, were also performed.
Interventions
BEHAVIORALActive control
Control group received a personalized advice on lifestyle modification to prevent dementia and usual care of Community Center for Dementia.
BEHAVIORALIntensive + Maintenance program
Both intensive and maintenance program 1. Intensive program The 4-week group-based intensive program was comprised of eight sessions; each session consisted of (1) a 30-min review of the tasks, (2) a 50-min training period, and (3) a 10-min meeting to assign tasks on an individual basis. A study nurse-guided training for modification of vascular risk factors, diet, cognitive and social activity were conducted, And, a physiotherapist conducted an exercise training mainly composed of muscle strengthening and stretching. 2. Maintenance program The allocated study assistants monthly check-up whether participants adhere to the altered habits or not, based on the workbook
BEHAVIORALIntensive program only
Only the intensive program was conducted. The 4-week group-based intensive program was comprised of eight sessions; each session consisted of (1) a 30-min review of the tasks, (2) a 50-min training period, and (3) a 10-min meeting to assign tasks on an individual basis. A study nurse-guided training for modification of vascular risk factors, diet, cognitive and social activity were conducted, And, a physiotherapist conducted an exercise training mainly composed of muscle strengthening and stretching.
Sponsors
Seoul Metropolitan Government
Seoul National University Hospital
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
PREVENTION
Masking
SINGLE (Outcomes Assessor)
Intervention model description
A single-blinded randomized controlled pilot study
Eligibility
Sex/Gender
ALL
Age
60 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
* Subjects aged 60 years and over with age-, sex-, education-adjusted z-score of the Korean version of mini-mental state examination for dementia screening (MMSE-DS) -1.5 standard deviation and above, but having some risk factors for dementia were included: at least two of following risk factors in a recent year (1) do not exercise with moderate degree more than 3 times a week, (2) do not read books, newspapers or magazine more than once a week; (3) do not meet friends, relatives, or close person more than once a week, (4) have depressed mood or low volition.
Exclusion criteria
*
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Changes from baseline Australian National University Alzheimer's Disease Index (ANU-ADRI) at 4 weeks and 24 week | baseline (0 week), 4-week, 24-week | The ANU-ADRI was developed based on review and meta-analysis of the literature regarding modifiable risk and protective factors for AD; it is a validated instrument assessing individual risk profiles for AD that combines the odds ratios of risk factors to derive a risk score. The total scores ranged from -18 to 63 for males, and from -18 to 66 for females; higher scores indicated greater risk for AD. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Changes from baseline total score in the CERAD neuropsychological battery at 4 weeks and 24 week | baseline (0 week), 4-week, 24-week | The CERAD neuropsychological battery includes various cognitive domains: memory, language, visuospatial, executive, etc. There are age-, sex-, and educational year-stratified norms; individuals' z-score can be calculated. |
| Changes from baseline Color Word Stroop Test (CWST) at 4 weeks and 24 week | baseline (0 week), 4-week, 24-week | CWST mainly can examine the executive function. There are age-, sex-, and educational year-stratified norms; individuals' z-score can be calculated. |
| Changes from baseline Short Physical Performance Battery (SPPB) at 4 weeks and 24 week | baseline (0 week), 4-week, 24-week | The SPPB was developed for evaluating lower extremity functioning in older persons. The scores range from 0 to 12; higher scores indicated better performance. |
| Changes from baseline EuroQol Five-Dimensional Questionnaire (EQ-5D) at 4 weeks and 24 week | baseline (0 week), 4-week, 24-week | The EQ-5D is consisted of five dimensions that include mobility, self-care, usual activities, pain/discomfort, and anxiety/depression. The total scores ranged from 5 to 15; higher scores indicated lower quality of life. |
| Changes from baseline Motivation to Change Lifestyle and Health Behaviors for Dementia Risk Reduction Scale (MCLHB-DRR) scale at 4 weeks and 24 week | baseline (0 week), 4-week, 24-week | The MCLHB-DRR was developed to understand beliefs underpinning the lifestyle and health behavioural changes needed for dementia risk reduction. Seven-factor solution (perceived susceptibility, perceived severity, perceived benefits, perceived barriers, cues to action, general health motivation, self-efficiency) with 27 items were included. The total scores ranged from 0 to 27; higher scores indicate higher motivation for reducing risk of dementia |
| Changes from baseline Seoul-Instrumental Activities of Daily Living (S-IADL) at 4 weeks and 24 week | baseline (0 week), 4-week, 24-week | The S-IADL includes 15 items in regard with various instrumental activities of daily living. The total scores ranged from 0 to 15; higher scores indicated lower level of daily function. |
Countries
South Korea
Outcome results
None listed