| It could be the elevation in stress hormones following exercise. My usual I:C ratio is 1:15, however following a long run of 15+ miles, I have to give 10 units of humalog to cover 45 grams of carbs immediately following exercise. That almost triple the amount of insulin usually needed. This is because stress hormones like epinephrine, glucagon, etc. are extremely elevated to supply muscles with energy being converted from fat stores. It takes an extra amount of insulin to counteract these hormones and bring my body back to homeostasis. | 
