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Examining the relationship between mild traumatic brain injury, later‐life brain health and cardiorespiratory fitness in a community‐dwelling sample of older adults

Traumatic brain injury (TBI) has been recognised as an important global health priority. Mild traumatic brain injury (mTBI), also known as concussion, accounts for up to 90% of all TBI diagnoses. Accumulating evidence also suggests that mTBI may be a risk factor for later‐life cognitive decline and neurodegeneration, including Alzheimer’s disease and other forms of dementia. Physical activity and exercise have received increasing attention as a potentially cost‐effective mechanism to attenuate age‐related declines to cognitive functioning and brain volume. However, little is known about the interaction between maintaining a higher level of physical fitness later in life and its impact on markers of brain health in individuals with a history of mTBI in the general population.