Hi there!

I just started running again for the first time since my DX just over a year ago.

About three weeks ago (maybe a month), I started out going for about an hour long run/jog. Exercise has always lowered my BG - for mountain biking, I would eat a bar before starting, and then usually take a gel packet every 45 minutes - more or less depending on how much climbing I'm doing. For skiing, a couple of Clif Blocks would cover me for an hour and a half of steady skiing. My BG before exercise has always been between 85-120 - and if I tend to be on the lower end, I'll add 1 Clif Block just to be safe - my BG has then been very predictable.

So, for my first run, I took one gel packet (about 22g carbs) before running and my BG was about 95 - I tested a half hour later and my BG was right around 95. I took another and at the end of the run my BG was back in the same range - it did dip a little later, but I ate a Dex tablet and that got me back to a normal range. This pattern essentially held very consistently for my first two weeks of running - there were variations up and down depending on how hilly the run was or if I went a bit longer, but generally speaking the pattern was very consistent.

We got some snow out here in Denver a week ago and I ended up not running for about 6 or 7 days. I've gone for two runs since the snow has lifted and in that short time my BG is going in a completely different direction: I take my usual pre-run carbs (same type/brand/qty, etc. as before), but now my BG will be around 145-160 a half hour into the run, will climb a bit or stay in the same range later in the run, and yesterday I was at 200 at the end of my run (and I stopped taking in sugar after my pre-run gel). These are the same runs I was doing a couple of weeks ago - everything I'm doing is 100% consistent as before, except my BG is acting completely differently.

With both skiing this season and mountain biking last spring/summer, my BG behaved extremely consistently from day 1 of the season to the end, regardless of me getting in better shape or skiing/riding different areas - so the sudden change with BG when running is pretty perplexing.

My BG does seem to drop to a more normal range a half hour after the run, but I hate the idea that I'm keeping it in the high 100's or even 200's - I certainly don't want to be dosing up a ton of sugar if my body is going to release it anyway.

Has anyone else had a similar experience? I'm curious to see if I should run without any sugar today, but that freaks me out if my BG all of a sudden starts acting "normal" and I end up crashing hard.

Sorry for the long email - just want to give full background - thanks!!


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Replies to This Discussion

Hmmmm. I have had the same thing happen. My numbers are now going up 2-4 hours after a run and they never have before.
My rule of thumb is to follow my protocol for my number reading right before I go out. If I am 80 to 110 I eat something prior thereto.
I actually don't eat before I go out if I am 110 and up , probably because it is not intense enough yet. (The carb ratio thing of 15 grams of carb for every hour of exertion.) The basal is a whole different diatribe.
I have had Type 1 for 53 years, and things are way better than they used to be. Sometimes I think my body reacts to re introducing exercise, because the insulin sensitivity is related to it. The more I exercise over a period of time, the more sensitive I become. Hope that helps.

Thanks Melinda!

I definitely notice my insulin sensitivity is way up now that I'm running - even more sensitive than when i was cycling regularly - that seems to do more with my bolus than my basal. Before I started running, if I was at 95 2 hours after a meal, chances were I would stay at 95 after that (or pretty close to it). Now, if I'm at 95 2 hours after a meal, it means I'll be around 60 a couple hours later - I chalk that up to my insulin sensitivity and my body reacting to the bolus for the full "lifetime" of my fast acting insulin.

I'm leaning towards following my usual protocol for now, just to be safe. If this trend continues I may start cutting my sugar intake.


All sounds good to me. I always relish hearing about PWD's like us that go out there and just do it. I think if regular people had to think about all the stuff we do, there might be a new appreciation of how far the big D impacts one's thinking , for the timing of everything.




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