Having high blood pressure in your 30s is associated with worse brain health around age 75, especially for men, according to a new UC Davis study.
The research, published this week in JAMA Network Open, compared magnetic resonance imaging (MRI) brain scans of older adults who had high blood pressure between the ages of 30 to 40 with older adults who had normal blood pressure.
The researchers found that the high blood pressure group had significantly lower regional brain volumes and worse white matter integrity. Both factors are associated with dementia.
The research also showed that the negative brain changes in some regions — such as decreased grey matter volume and frontal cortex volume — were stronger in men. They note the differences may be related to the protective benefits of estrogen before menopause.
“Treatment for dementia is extremely limited, so identifying modifiable risk and protective factors over the life course is key to reducing disease burden,” said first author Kristen M. George, an assistant professor in the Department of Public Health Sciences.
“High blood pressure is an incredibly common and treatable risk factor associated with dementia. This study indicates hypertension status in early adulthood is important for brain health decades later,” George said.
The rate of high blood pressure varies by sex and race. About 50% of men have high blood pressure compared to 44% of women. The rate of hypertension is about 56% in Black adults, 48% in white adults, 46% in Asian adults and 39% in Hispanic adults. African Americans ages 35 to 64 years are 50% more likely to have high blood pressure than whites.
The researchers looked at data from 427 participants from the Kaiser Healthy Aging and Diverse Life Experiences (KHANDLE) study and the Study of Healthy Aging in African Americans (STAR). This provided them with health data from 1964 to 1985 for a diverse cohort of older Asian, Black, Latino and white adults.
They obtained two blood pressure readings from when the participants were between the ages of 30 to 40. This allowed them to determine if they had been hypertensive, transitioning to hypertensive or had normal blood pressure in young adulthood.
MRI scans of the participants conducted between 2017 and 2022 allowed them to look for late-life neuroimaging biomarkers of neurodegeneration and white matter integrity.
A significant reduction in cerebral gray matter volume is seen in both men and women with hypertension but is stronger in men.
Compared to participants with normal blood pressure, the brain scans of those transitioning to high blood pressure or with high blood pressure showed lower cerebral gray matter volume, frontal cortex volume and fractional anisotropy (a measure of brain connectivity). The scores for men with high blood pressure were lower than those for women.
The study joins a growing body of evidence that cardiovascular risk factors in young adulthood are detrimental to late-life brain health.
The researchers note that due to the sample size, they could not examine racial and ethnic differences and recommended interpreting results regarding sex differences with caution. They also note that the MRI data was only available from one time-point late in life. This can only determine physical properties like volumetric differences, not specific evidence of neurodegeneration over time.
Kristen M. George, Pauline Maillard, Paola Gilsanz, Evan Fletcher, Rachel L. Peterson, Joseph Fong, Elizabeth Rose Mayeda, Dan M. Mungas, Lisa L. Barnes, M. Maria Glymour, Charles DeCarli, Rachel A. Whitmer. Association of Early Adulthood Hypertension and Blood Pressure Change With Late-Life Neuroimaging Biomarkers. JAMA Network Open, 2023; 6 (4): e236431 DOI: 10.1001/jamanetworkopen.2023.6431
University of California – Davis Health. (2023, April 7). High blood pressure in your 30s is associated with worse brain health in your 70s. ScienceDaily. Retrieved April 12, 2023 from www.sciencedaily.com/releases/2023/04/230407110728.htm