| Insulin is the key, as far as I am concerned. My experience has been that exercise always brings blood sugar down, as long as there is enough circulating insulin. And exercise never increases blood sugar in the presence of adequate circulating insulin. To the extent that you are using glucose in the bloodstream to fuel exercise, your insulin requirements go up. And not supplying it starts a chain reaction that increases you blood sugar.
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In my humble opinion  
Type1 since 1977
MDI using Lantus, Novorapid and Actrapid
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