Understanding the Role of Physical Activity in Aging and Brain Health
Physical Activity and Pathological Aging
As individuals age, there is a prevailing belief that physical activity may help mitigate pathological aging and reduce the risk of dementia. Research using animal models indicates that physical activity fosters the growth of new neurons through the expression of growth factors, enhances cell survival, and promotes synaptic plasticity. In contrast, studies involving humans suggest that the benefits of physical activity are more indirect, chiefly by lowering cardiovascular risk factors.
Impact of Cardiovascular Risk Factors on Brain Health
Cardiovascular risk factors have been shown to adversely affect both brain structure and function, consequently heightening the likelihood of developing dementia. A recent study involving 134 cognitively unimpaired older adults, with a minimum age of 65, sought to explore the relationship between physical activity and brain integrity using advanced multimodal neuroimaging techniques.
Key Findings of the Study
The researchers discovered that global grey matter volume was influenced by cardiovascular risk factors, particularly insulin levels and body mass index (BMI). Notably, the study also revealed an independent relationship between physical activity and glucose metabolism in the brain, which was not affected by cardiovascular risk factors. This finding is significant as obesity and insulin dysfunction, which often accompany aging, are recognized risk factors for cardiovascular issues and various brain health challenges, including atrophy, cognitive decline, and the onset of dementia.
Inflammation and Oxidative Stress
Both obesity and insulin resistance can negatively impact brain health by serving as sources of inflammation and oxidative stress, factors that can elevate the risk of dementia. The independent link between physical activity and brain glucose metabolism is partially attributed to the high nutrient and energy demands associated with metabolic pathways.
Promoting Brain Health through an Active Lifestyle
Maintaining an active lifestyle and achieving a lower BMI may contribute to regulating insulin metabolism and controlling inflammation. These factors play a crucial role in promoting overall brain health.
Reference
Felisatti F; Gonneaud J; Palix C; et al. (2022) ‘Role of Cardiovascular Risk Factors on the Association Between Physical Activity and Brain Integrity Markers in Older Adults’ Neurology DOI: 10.1212/WNL.0000000000200270