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Brain lactate as a mechanism linking exercise to brain health across the lifespan
Secondary Supervisor(s): Prof Sam Lucas
University of Registration: University of Birmingham
BBSRC Research Themes:
Project Outline
Physical exercise supports brain health across the lifespan, but the biological signals linking working muscles to changes in the brain are not fully understood. Lactate was once viewed mainly as a by-product of exercise, but it is now recognised as both an energy source and a signalling molecule. During exercise, lactate in the blood can cross into the brain and contribute to brain metabolism. However, we do not know how much exercise is needed to increase brain lactate, whether this response changes with ageing, or whether it is linked to other markers of brain health.
This PhD will investigate how exercise dose and ageing influence brain lactate and whether lactate may help explain how exercise supports brain health.
Objective 1 will identify the minimum exercise dose needed to increase brain lactate in younger adults. Participants will complete three high intensity exercise conditions made up of 1, 5 or 10 bouts of 30 seconds. Brain lactate will be measured before and after exercise using magnetic resonance spectroscopy, a non-invasive brain imaging method. Blood lactate will also be measured.
Objective 2 will test whether the same brain lactate response differs in older adults. The same exercise conditions will be used, allowing comparison of brain and blood lactate responses between younger and older groups. Blood markers linked to brain protection, nerve cell health and support cells in the brain will also be measured.
Objective 3 will test whether consuming lactate can alter brain lactate at rest and during exercise. Participants will consume a lactate-containing gel or placebo, and brain and blood lactate will be measured before and after rest or exercise.
The project combines exercise physiology, brain imaging and blood analysis to improve understanding of how lactate may link exercise with brain health across the lifespan.