Yes, I do think @Eric is the one to see to be sure, but I can say I seem to see the beginning of a dip a couple of hours after a big run, and the decrease in insulin needs can take me deep into the night. I don’t run in the morning as often as I would like, so this would be in response to a midday or early afternoon run.
Eric has me evaluating my runs according to RPE, or rate of perceived effort. I love this because instead of just thinking about a workout in terms of good or decent, or some other vague identifier, I now can assign a value. In general, the workouts that cross into the 6s and higher, which would be a solid moderate at the least, are the ones I start to see a more profound effect. I’m not sure what types of runs you’re taking, but are all on the same level in terms of exertion?
You asked about refueling. No wonder I answered something else. I’m a terrible refueler. I am trying to nail down a post-run banana. That’s my big dream. So far I have not been able to eat the banana when I want it but rather when my blood sugar dictates it’s okay. That means I don’t get it sometimes for a couple of hours after finishing, which I know is not ideal. I have not noticed any difference in blood sugar following the variance in banana consumption. If I run hard, I have to be prepared to crash for many hours following. If I run at a leisurely clip, it’s insulin business as usual. No matter when the nana happens. So… I don’t know.