Impact of Exercise on Blood Flow in Mild Cognitive Impairment
Understanding Mild Cognitive Impairment
Researchers have conducted studies on individuals with mild cognitive impairment (MCI) to explore the effects of exercise on brain function. Changes in blood flow within the brain are thought to contribute to the cognitive challenges faced by those with MCI. While there is no current cure for this condition, exercise has been recognized for its potential to enhance vascular health, prompting researchers to investigate its influence on the brains of MCI patients.
MCI affects nearly 25% of older American adults and is characterized by diminished memory and cognitive skills. Individuals with MCI are also at a heightened risk of progressing to dementia.
Study Overview
A recent article published in the Journal of Alzheimer’s Disease detailed a study that analyzed brain function in MCI participants before and after an exercise regimen. The study excluded potential candidates with neurological disorders, including multiple sclerosis and Parkinson’s disease, ultimately involving 17 participants with MCI and 18 cognitively healthy individuals.
Prior to commencing the study, MRI scans measured blood flow in brain regions associated with Alzheimer’s Disease, alongside cognitive assessments. Participants engaged in treadmill walking for 30 minutes daily over four weeks, with intensity gradually increasing. This intensity was sustained for an additional eight weeks, after which cognitive tests and follow-up MRIs were conducted.
Findings on Blood Flow and Cognitive Function
The results revealed that exercise led to a decrease in blood flow in the brains of individuals with MCI, while those without neurological impairments experienced an increase in blood flow. Notably, cognitive function scores improved for both groups.
Researchers hypothesize that in response to cognitive decline associated with MCI, the brain may increase blood flow to enhance cognitive abilities. However, this response may inadvertently contribute to further cognitive decline, explaining the observed decrease in blood flow alongside improved cognitive health following exercise.
Future Research Directions
Future studies should incorporate a control group that does not participate in exercise for comparative analysis. Additionally, research should investigate whether the changes in blood flow following exercise are temporary or have lasting effects.
References
Alfini, A.J., Weiss, L.R., Nielson, K.A., Verber, M.D., & Smith, J.S. (2019). Resting Cerebral Blood Flow After Exercise Training in Mild Cognitive Impairment. Journal of Alzheimer’s Disease, 67, 671-684. https://doi.org/10.3233/JAD-180728