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As a runner I was told that the liver holds about 600 calories of glucose, which would be roughly an hour of exercise. Though the body doesn’t run straight to t
by porknubbins 5y ago
As a runner I was told that the liver holds about 600 calories of glucose, which would be roughly an hour of exercise. Though the body doesn’t run straight to the egde of zero glucose, I think it alters the fat/glucose ratio during the first hour of exercise and the 50/50 point is about 30 minutes. Obviously very roughly and assuming normal physiology but matches your experience.
- nradov 5y agoThe fat/glucose ratio depends on effort intensity and individual physiology. At very low aerobic intensities metabolically healthy people get most of their energy from fat. As intensity increases the mix shifts until you're burning almost 100% glucose and 0% fat near max anaerobic effort. This makes sense because fat metabolism requires more oxygen and you hit a limit on how much oxygen you can pull into your bloodstream. Once stored glucose is depleted then either you need to consume some carbs, or drop the intensity way down. The point at which that happens varies widely based on multiple variables.