Functional imaging of working memory and peripheral endothelial function in middle-aged adults

Area of Science:

• Neuroscience
• Cardiovascular Health
• Cognitive Aging

Background:

• Vascular health, assessed via flow-mediated dilation (FMD), is a key indicator of endothelial function.
• Aging is associated with changes in both vascular health and cognitive function, particularly working memory.
• Understanding the link between vascular health and brain function in middle age is crucial for predicting cognitive decline.

Purpose of the Study:

• To investigate the relationship between flow-mediated dilation (FMD) and brain activation during a working memory task in healthy middle-aged adults.
• To determine if vascular health markers predict cerebral hemodynamic responses during cognitive challenges.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to measure brain activation during a 2-Back working memory task in 42 healthy middle-aged adults.
• Brachial artery flow-mediated dilation (FMD) was assessed using B-mode ultrasound.
• Hierarchical linear regression was employed to analyze the association between FMD and brain activation in predefined regions of interest.

Main Results:

• Flow-mediated dilation (FMD) was significantly associated with reduced working memory-related brain activation in the right superior parietal lobule (p=0.027).
• This relationship remained significant after controlling for age, sex, systolic blood pressure, and full-scale IQ.
• The findings suggest a link between preclinical markers of endothelial dysfunction and altered cerebral hemodynamics.

Conclusions:

• Preliminary evidence supports an association between endothelial function (FMD) and brain activity related to working memory in healthy middle-aged adults.
• Endothelial dysfunction may be linked to cerebral hemodynamic alterations.
• Further research is warranted to explore the prognostic value of FMD for future cognitive impairment, given the modifiable nature of endothelial function.