This is amazing!! Wow, I’m so glad you posted this because I would never know this is possible in a T1D! And fortunately, I read it BEFORE my run, so I tried to apply it today on the beach, at least as far as MY body works!
I think I have been much too aggressive with my boluses during runs. Yesterday was sort of a disaster at the beach, taking 0.5U pre-run for 20g carbs. About 40 mins into the run I crashed and spent the rest of the run feeding myself Sport Beans!
Today was much better. Running in the morning is problematic for me since I sometimes have dawn phenomenon, as many do. By the time I started the run I was at BG 126 from around 70 on wakeup. I resisted taking any correction though knowing what yesterday did with insulin on board!
I didn’t take carbs or bolus pre-run, and ran 'til I saw a steady downturn 'til BG was 90. Took 6 beans, or about 12g carbs (I think), and bolused .025U for it. I thought this might be too much, but since I was using my Apple watch, that was the only option with increments of 0.25U (I will change my Loop code to use increments of 0.1U!)! And continued this throughout the run, ending at BG 76. No lows during the run I think post-run, I should have had more carbs, because I trended low all afternoon Just as you suggested, Eric!! Eventually the body will take what it needs, and it did, ending in a slight low, and THEN I had the extra 10g carbs!
Run itself was very tough, with soft sand like quick sand, not to mention the high temps! I concentrated on just finishing!
08:31 Run Start, BG 126, Scheduled Basal 0.5U, except for initial 30 mins, Loop primarily gave ZB
09:18 BG 90, 6 Sport Beans 12g carbs, Bolus 0.25U
09:30 BG 70, 5 Sport Bean 10g
09:54 BG 64, 2 Sport Bean 4g
10:33 Run end, BG 76, Bolus 1.5U, Walk 30 mins
10:54 Post Run BG 96
11:04 Refuel, BG 84, Boost 16g, Walk 20 mins, BG steady around 80
Duration: 1 hr 57 mins
Distance: approx. 10 miles