Global brain venous oxygenation is associated with cardiorespiratory fitness in older adults

T2‐Relaxation‐Under‐Spin‐Tagging (TRUST) is an MRI technique which allows for the measurement of brain blood oxygenation. Global venous oxygenation has been shown to decrease over the course of life and may prove useful as a measure of brain aging. No studies to date have examined the association between cardiovascular fitness and brain venous oxygenation.