Summary: Vascular and inflammatory problems during middle age, as well as some minor injuries, could be a biomarker for poor brain health in older age. However, brain aging may be delayed by maintaining a healthy diet, weight and level of physical activity as we age.
Source: American Geriatrics Society
Cognitive decline is the medical term for a decline in your abilities to think, remember, and make decisions. Researchers know now that cognitive decline may begin in midlife and can develop over a period of 20 years or so. In a new study, published in the Journal of the American Geriatrics Society (JAGS), researchers identified factors associated with brain health in middle age in order to identify ways to preserve brain function when people are older.
Several studies have shown links between changes in the senses and the development of cognitive decline. In earlier studies, the research team responsible for the new JAGS report found that problems with hearing, vision, or the sense of smell were associated with poorer cognitive function in middle-aged adults. These changes also have been linked to developing cognitive impairments for older people.
To learn more in this new work, the researchers used information from the ongoing Beaver Dam Offspring Study (BOSS; conducted from 2005 to the present), a study of the adult children of participants in the Epidemiology of Hearing Loss Study, a population-based study of aging.
Hearing, vision, and the ability to smell were measured with highly sensitive tests. The participants also took tests to measure their attention, thinking, and decision-making abilities, as well as their memory and ability to communicate. The researchers then combined the results of all these tests to use as a measure of the participants’ brain function. Blood tests and other measurements were also taken to create a complete health picture for each participant.
There were 2,285 participants included in this study, and most were younger than 65 years of age. Although those participants with signs of brain aging had overall worse performance on the sensory and cognitive tests, their losses in function were mild on average.
The researchers reported that participants who smoked, had larger waists, or had health issues related to inflammation or cardiovascular disease were more likely to show signs of brain aging. Older participants and those with diabetes were also more likely to develop brain aging over the following five years. Participants who exercised regularly or had more years of education were less likely to show signs of brain aging.
The researchers said their findings add to evidence that issues like diabetes, as well as other related health concerns impacting circulation, inflammation, and metabolism (the medical term for the chemical reactions in our bodies that help sustain life, such as converting food into energy), are important contributors to brain aging.
The researchers also noted that even minor injuries to the brain can have long-term effects on brain function. Participants with a history of a head injury had a 77 percent increased risk of developing brain aging. Symptoms of depression were also associated with an increased risk of brain aging.
The researchers said their findings suggest that some brain aging may be delayed or prevented. Just as middle-aged people can take steps to prevent heart disease by maintaining a healthy diet and weight and keeping physically active, they can also take steps to prevent early changes in brain health.
“Healthy lifestyles are important for healthy aging, and making healthy choices earlier in life may improve health later in life,” said lead author Carla R. Schubert, MS. The researchers concluded that identifying and targeting risk factors associated with poor brain function when people are middle-aged could help prevent cognitive decline with age.
About this neuroscience research article
Source: American Geriatrics Society Media Contacts: Daniel E. Trucil – American Geriatrics Society Image Source: The image is in the public domain.
OBJECTIVES Middle age has been identified as a critical time period for health later in life. Identifying factors associated with worse brain function in middle‐aged adults may help identify ways to preserve brain function with aging. Our objective was to evaluate factors associated with a novel measure of brain aging in middle‐aged and older adults.
DESIGN Longitudinal cohort study.
SETTING Beaver Dam Offspring Study (BOSS) baseline (2005‐2008), 5‐year (2010‐2013), and 10‐year examinations (2015‐2017).
PARTICIPANTS A total of 2285 adults, 22 to 84 years of age, with complete sensorineural and neurocognitive data at the 5‐year examination.
MEASUREMENTS Principal component analysis (PCA) was performed combining 5‐year sensorineural (hearing, vision, olfaction) and cognitive (Trail Making Test A and B, Digit Symbol Substitution Test, Verbal Fluency Test, Auditory Verbal Learning Test) test data. Participants with a standardized PCA score less than −1 were classified as having brain aging. Incident brain aging was defined as a PCA score less than −1 at 10 years among participants who had a PCA score of −1 or higher at 5 years. Logistic regression and Poisson models were used to estimate associations between baseline factors and prevalent or incident brain aging, respectively.
RESULTS Older age, being male, current smoking, larger waist circumference, not consuming alcohol, cardiovascular disease, and interleukin‐6 were associated with greater odds of prevalent brain aging, whereas more education and exercise were associated with decreased odds. In addition to age and sex, less than a college education, higher levels of soluble intercellular adhesion molecule‐1, diabetes, depressive symptoms, and history of head injury were associated with an increased 5‐year risk of incident brain aging.
CONCLUSION In the current study, vascular and inflammatory factors were associated with a new brain aging marker in middle‐aged and older adults. Many of these factors are modifiable, highlighting the importance of addressing health and lifestyle factors in midlife to potentially preserve function for better brain health later in life.