Found this thread whilst trawling looking for info on exactly the same phenomenon as @sw600 describes in the OP. I'm a keen, competitive, orienteer, with a similar health backgrouns to sw600: prediabetic for around 5 years, A1c in low 40s. In my first race since wearing a Libre had exactly the same thing happen to me, with the highest BG reading I've yet had of around 12, peaking half an hour into the race where I was running between midday and 1 (see screenshot). This was after I'd had my regular pre-race breakfast of porridge and berries in an otherwise low (not keto) diet, which is what caused the earlier spike (which actually measured at 10.4 - the graph line doesn't always match the individual recordings, and I'd be interested to know why - presumably some sort of smoothing?).
This thread is some sort of comfort - not alone! - but it seems to me that the pre-race carbs suggestion is not the solution, if a solution is needed, ie this is a normal phenomenon???
Incidentally, my training runs earlier in the week, one purely a recovery session the other fartlek, and the single gym session, had no impact whatsoever on BG levels.
On a slightly divergent note, it does seem that the strongest reaction I get so far is with porridge. Tried it a couple of different ways since starting the Libre, and both times it's sent my levels into double figures. Even bread, rice and scone (all experimental!) have all only hit the 8s and low 9s.
This thread is some sort of comfort - not alone! - but it seems to me that the pre-race carbs suggestion is not the solution, if a solution is needed, ie this is a normal phenomenon???
Incidentally, my training runs earlier in the week, one purely a recovery session the other fartlek, and the single gym session, had no impact whatsoever on BG levels.
On a slightly divergent note, it does seem that the strongest reaction I get so far is with porridge. Tried it a couple of different ways since starting the Libre, and both times it's sent my levels into double figures. Even bread, rice and scone (all experimental!) have all only hit the 8s and low 9s.
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