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Would the increase be due to the liver having to release some glucogen during exercise, perhaps? Curious....
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this would be it ;-)
there are 2 responses to exercise (there are more but these are relevant to diabetes)
1) the muscles become more sensitive to insulin - and this effect can last several hours afterwards. One of the reasons that exercise is recommended for type 2, as it helps lower insulin resistance.
2) the second effect occurs with more intense exercise. The body's response is to release glucose from the liver to try and supply your energy hungry muscles. This effect can be quite dramatic and can overwhelm your body's ability to produce insulin to lower it. I find this effect lasts at most a couple of hours after exercise has stopped.
I'm a type 1 and effect number 2) can cause very dramatic rises in BG - played paintball a couple of months back, and my BG skyrocketed from 6mmol (108) all the way up to 19 mmol (340) - and that was with correction shots. The BG rise was down to the very intense activity associated with charging around the woods.
