I usually start the day before, eat a larger than usual lunch and skip dinner. Before the 1/2s I’ve run, I had some social stuff and drank a couple of beers but that’s about it the night before. Breakfast= toast. I avoid eating a lot. Jeff Galloway’s running books suggest this, as it takes the port-a-potties out of the equation. It also seems to be a decent way to get my BG stable, although I have a pump?
1/2 marathon#1 was in a forest preserve, about 300 people, really nice day for a race, mid-30s when we started but bright, clear skies. I had about an hour trip to get there and was all set to go when I got out of the car. The crowd was pretty fast as the organizer (my aunt…) runs ultramarathons. This one was about a week after I got the CGM. I got the hang of it but the tape, the IV3000 stuff MM gives you with it, fell off, followed shortly thereafter by the sensor which I was fortunate enough to get before it fell off. No data but I just kept running. It was very peaceful to just run through the woods. It was an out and back but the crowd coming back were running pretty fast. There were quite a few hills towards the end but, at the top of the last one, you could smell the burgers they had going on the grill!! It was in the 50s by then and a nice downhill jog. I don’t recall any BG issues. Unfortunately, I don’t recall any diabetes stuff at all from that race.
1/2 #2 was two weeks later and was about 14000 people in Champaign, IL, where we’d moved from the previous year. I’d been there about 30 years to the route was really a walk down memory lane. I did the same ‘no dinner’ plan which worked ok, woke up 90 or so, ate a piece of toast w/ a partial bolus and then noted BG of like 100 about an hour before showtime so I drank a small glass of OJ. I’d acquired some stickier tape so CGM was working and, about 2 miles into the race, of course, it was showing 160 so I was getting nervous so I just did a CB to the 160# (although it may have been higher, as the CGM typically lags behind?) and cut it to maybe 1/2 or 2/3 the dose (sorry I don’t remember). It drifted down to 120ish a couple miles later and pretty much stayed there the rest of the race.
Except for the fast/ forest preserve race, I’ve run a few 5K too and there are always people puking. I have not checked to see if they have diabetes but I’d think not? I suspect that it may be eating the night before, the whole “pasta feed” tradition and people getting carried away with that and eating more than they need? I’m not quite sure how I’d approach MDI and a race though. I switched from R/N to a pump and find that pretty handy for running.
Did you check your BG in the race? I did that in 1/2 #1, since the CGM failed and it wasn’t that big of a deal. One lady who was about 60 (but wearing an Ironman shirt…) ran by and yelled ‘keep going’ when I slowed to a walk to test once but I SMOKED her at the end, when I smelled the burgers! LOL. And thanked her for keeping me going, of course! I would think that it would be useful to have some lantus on board so you could hit some or even all of the gatorade stops? Even people w/o diabetes need carbs and the puking might be from not being able to have any if your BG is high? It might be useful to do like a 50% dose and see how that goes? What do you do on your training runs?