I've been told or read somewhere that after about 20 - 30 minutes after you start running (or any other cv exercise for that matter) you start to burn fat. before then you're mainly burning glucose from the muscles and liver. what i'm wondering is what the mechanism is that signals the change from glucose on it's own to the mix of glucose and fat. Is it down to the levels of stored glucose in the liver? or is it the amount of time? or what? I don't remember what the chemical path is for turning fat into energy but I always find that during the begining phase of a long run I'm breathing more heavily than than at the end phase even though i'm running just as fast. So i'm thinking that maybe less oxygen is required which brings me onto the isotonic drink that i'm consuming as i'm running; will taking in this extra glucose from the drink delay the point at which i start to burn fat in a greater ratio?
when the fat burning kicks in
- Thread starter jarrick
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