Last year I spent two seasons swimming on MDI. Every 20 minutes, I would take 15 grams of sugar. After practice I did not run low.
This year swim season started a few weeks ago. I could not start early on because I had just started on my pump, and needed to get tuned up. Last week I went to my first practice, but did not swim because i could never get above 75. I had too much IOB due to a peak and correction.
This evening I went to a 1-hour practice. One hour and a quarter before practice, I was low, so I set up a 50% temp basal. Then, 45 minutes before practice, I set my temp basal to zero. 10 minutes before getting into the water I was still a bit low, and I took 10 grams of sugar. I swam for one hour non-stop, medium effort, and stayed between 72 and 95 all along, I was quite flat! I did not have to take sugar at all.
So that’s really good. What was not so good was that I ripped my pod while swimming against the lane separator, and found out when I got out of the pool that I did not have my insulin pen with me. So I could not inject for 45 minutes after practice, until I got home. I did not refuel after practice either because I knew I would run high. I got a new pod on with basal on 55 minutes after the end of practice. I peaked in the mid 130s, but it took me 3 hours after practice until I was low enough to have a full dinner despite taking a lot of insulin (twice as much as I was expecting to need, over more than 2 hours) – not good for refueling.
So imho good start but lots of room for improvement.