Rising blood sugar without eating anything?

[Bitfedup]

Greetings all,
I have noticed that after a bout of heavy exercise my blood sugar reads as comfortably low ( between 4-5) but rises afterward to as high as 8 to 9.5 before dropping again without me eating or drinking anything but water.

what’s all that about?

 

[JoKalsbeek]

Greetings all,
I have noticed that after a bout of heavy exercise my blood sugar reads as comfortably low ( between 4-5) but rises afterward to as high as 8 to 9.5 before dropping again without me eating or drinking anything but water.

what’s all that about?

Likely a liver dump. It thinks it's helping, dumping stored glucose into your bloodstream when you've not eaten, but are active. It thinks you might need the energy. Perk: the excess glucose stored in the liver is gotten rid of, slowly but steadily.

 

[SimonP78]

Rises post-exercise are quite typical.

As @JoKalsbeek says this is almost certainly due to your liver having upped it's glycogen->glucose conversion rate while you exercise. My feeling is that the post-exercise peak size depends on what exercise intensity you're doing (so how much the liver is converting) and also whether you've exercised for sufficiently long to exhaust your liver's glycogen stores (1.5h+ depending on exercise intensity amongst many other things) after which point there's no peak going on unless you've eaten during the exercise and you get a slow absorption peak (digestion is slowed quite considerably while doing fairly intense exercise)