Tag #Energy Metabolism

What is the immediate impact of a marathon on brain myelin levels, and what does this reveal about the brain's energy metabolism?

A study of ten marathon runners showed a temporary reduction in brain myelin (a fatty substance) after a 42km race, with levels fully recovering within two months. Researchers observed that myelin, typically 70-80% lipid, was used as an energy source when carbohydrate reserves were depleted. This suggests the brain strategically utilizes myelin as fuel during extreme endurance events.