Exercise - still affected 24 - 48 hours later, what's your approach?

Yep. I reduce my basal for up to 48 hours depending on the type and intensity of my exercise.
When we exercise, our liver releases more glucose and our insulin becomes more effective. As a result, there is less glucose for the liver to release until it has topped up its reserves. This may also affect bolus doses because more glucose is being reserved so less makes it directly to increase bg.
Runsweer.com has some great exercise advice.

I also drop my basal after exercise (I'm on MDI). I've started doing HIIT classes once every 2 days and so I've had to reduce it by 1unit just because I can see I'm running lower generally. My meal after my HIIT ends up being about 50%less insulin than if I hadn't done the exercise, even if it's rice/pasta/potato based.
In addition to @helensaramay like the liver, the muscles too are stimulated to take up glucose due to exercise even when you have no insulin on board, so having some there helps them do it quicker but BG can drop quite a bit depending on the muscle group you have been working on.
I'm sure you'll crack it with some experimentation!

tiredoftrying2017 said:

Thank you!

I've had T1 for long enough to know this but it's exercise I'm really struggling with!

Just about mastered the during and after BS maintenance it's just these drops I need to sort out.

Click to expand...

You might want to think about reducing your I:c ratio (or increasing, I can never figure out how that works syntaxicaly, but whichever means you take less insulin with your bolus). Something like HIIT can have quit a prolonged effect, working the muscles will wake up the GLUT4 receptors, allowing some glucose to get into the cells without the need for insulin. GLUT 4 can stay active for a while after exercise, meaning you don't need as much insulin because there's an alternative route for the glucose to get in the cells. The exercise itself will burn up glucose stored in muscles and if really intense it will also burn off glucose from the liver stores, when liver stores are used up the body prioritises restocking them, and it does this to a lesser extent in replenishing muscle glucose stores. So, instead of glucose staying in your blood, it's immediately siphoned away to restock the stores & until you've restocked your stores, that's what your insulin is being used for, again meaning you might not need to be as generous as usual with a meal time bolus, or just have a little uncovered carbs on top.

Hi @tiredoftrying2017 - this article might help you understand how sensitivity changes after exercise: http://www.diabettech.com/openaps/w...autosens-function-within-openaps-an-n1-study/

Basically what it shows is that for me there is roughly 36 hours of increased sensitivity to insulin post exercise that I need to be aware of.

In research on Type2, HIIT has been sown to be VERY effective at reducing insulin resistance both in the short term and the long term.