I like to do "ultra" trail runs, all of marathon distance or less but with high elevation gains. I was diagnosed as Type 2 Diabetic last September when I fell on a trail race and needed multiple leg surgeries to eliminate the ensuing infection. I have now been rehabbing for about 6 months and getting ready for my first trail race Saturday, 16.5 miles and 4000+ feet of elevation.
I manage my glucose with a low carb diet, twice a day doses of 500 mg Metformin, and 15 units of Levomir each night. I maintain a blood sugar level in the 100-115 range normally with this regimen. I have measured my blood sugar after hard weight workouts with my personal trainer and those have always been high (160-180). I have been doing hikes of increasing distance as well as increasing my run distances. The trail "runs" I compete in are often steep uphill speed hikes (500-1500 ft at 20-40% grades) followed by steep downhill runs, with the rare flats also being run sections.
Yesterday I did a run of nearly 14 miles with over 4000 feet elevation in two long hard climbs. I PRed both climbs, so my level of effort was exceptionally high. For the first time on a hike, I decided to measure blood sugar during the workout, and now regret not stopping to do so more often. Bottom line is that at the halfway point I had a 166 blood sugar and after finishing I was 144. Yet I felt like I was not getting enough energy to my muscles. By the 10 mile mark (3:40 into my workout) I really couldn't stomach food, and although i was on the easiest downhill section, at 11 miles I was out of energy and had to hike it in for the last few miles (and the running in that mile was 16 min/mile, well than my desired pace of 10-11 min/mile). But my glucose was high enough that it should have sustained me.
I have read a lot of info on high and low sugar and am frankly confused about what causes my sugar to be high, and why I lose energy with high blood glucose levels. Most of what I read seems to be from Type 1 diabetics with pumps, which is not my situation. I do think I got a bit behind on fluids, but not horribly so, and it was warm enough that the effort probably raised my core temp. Any thoughts on this are welcome, and thanks in advance. I want to learn how to continue my activities with better results.