Multicomponent Program for Addressing Cognition in Rural Communities

Overview

The study is designed to develop and evaluate a multicomponent intervention program among older rural-residing and African American residents with a long-term goal of reducing risk factors for Alzheimer's disease. The motivation for this study is that previous non-pharmacological (e.g. exercise diet, social engagement) interventions have improved cognitive function in older adults with and without cognitive impairments, but these studies were largely conducted without substantial representation from residents living in rural communities or African Americans. Due to geographic, sociocultural, and environmental differences between rural residents, African Americans and other populations, it is unclear whether positive findings from previous interventions will translate to rural residents or African American individuals.

It is estimated that just over 5 million Americans are currently living with Alzheimer's Disease (AD) , and that number will rise to approximately 9 million by 2050. Rural areas were shown to have 1.4 - 1.7 times higher risk of developing dementia compared to urban areas and risk was shown to be increasing in comparison to urban areas. Risk factors in rural populations include age, lower levels of education, less access to health care, and higher rates of chronic disease. The prevalence of AD among African Americans is also elevated as it is approximately double that of non-Hispanic white Americans and older African Americans may be as much as 64% more likely to develop AD compared to non-Hispanic white Americans. Some contributors to AD are similar across rural residence and African Americans, including limited health care access, lower levels of trust in physicians, limited transportation, and built environmental issues. However, to date, there are few studies that have engaged in intervention work to address reduction of AD risk factors in older adults residing in rural communities. This is particularly true for older African Americans who may face increased barriers. Therefore, there is a need to conduct more AD prevention interventions in rural communities and especially those with large proportions of African Americans. A large literature suggests that modifiable lifestyle behaviors are associated with the risk of developing AD. For example, both cross-sectional and longitudinal studies show that lower levels of physical activity and poorer dietary intake are associated with higher risk of developing AD. African Americans have low levels of physical activity and poor dietary quality compared to corresponding non-Hispanic white Americans. Studies in cohorts with predominantly low African American representation have shown that increasing physical activity, improving dietary intake, and engaging in cognitive training, individually, have all increased cognitive test scores across multiple domains. In addition, recent data (again from predominantly white cohorts) suggests that simultaneously changing multiple of these lifestyle behaviors at the same time may engage multiple, possibly synergistic neuroprotective mechanisms and thereby maximize neuroprotective benefits. Multicomponent interventions, or non-pharmacological interventions that address several behaviors simultaneously (e.g. physical activity, diet, cognitive training, sleep) have been shown to be effective in improving cognitive function in older adults. Recently, the two-year Finnish Geriatric Intervention study to Prevent Cognitive Impairment and Disability (FINGER) trial intervened on physical activity, diet, cognitive training, and cardiometabolic health management simultaneously; those in the intervention had significant improvements in global cognitive function, executive functioning, and processing speed, compared to a group receiving usual health care. The FINGER results were so impressive that a worldwide network of FINGER replication studies have been engaged, including the POINTER study in the United States. However, to our knowledge, none of these multicomponent studies have included a large number of rural residents or African Americans. We will develop a multicomponent intervention specifically tailored to older adults living in rural communities, and recruit at least 20, with a maximum of 40, adults into it. The 12 session intervention will consist of group-based lifestyle change sessions at a facility determined by the community. Cognitive functioning will be assessed to determine the brain effects of the intervention in this understudied population. Specific Aim 1: To determine if a multicomponent intervention is feasible to deliver in older rural-residing adults. Hypothesis 1: We hypothesize that the intervention will be feasible to deliver. Feasibility will be assessed through recruitment, retention, attendance, and satisfaction ratings. Specific Aim 2: To determine if a multicomponent intervention in older rural residing adults improves cognition in the following domains: attention, processing speed, memory, and executive function. Hypothesis 2: We hypothesize that changes in all cognitive domains will improve in the interventions compared to baseline. Change over the course of the intervention will be assessed in key AD related cognitive domains (attention, processing speed, memory, and executive function). Collecting this data sets the stage for the definitive study of the benefits of a multicomponent intervention in rural, diverse (e.g. 50% African American) residents. This will involve collecting measures of amyloid, tau, inflammation, brain metabolism, comparing findings to a control group, and assessing other AD-relevant pathways in older rural, diverse (e.g. 50% African American) adults, which could in turn increase understanding of neurobiological mechanisms and optimal physical activity recommendations for older adults residing in rural communities.