Insulin Types

I don't dislike you being a teacher - just if you ignore people it could be a deemed unprofessional?! As for you being very active, I'd still maintain that your main problem is being low carb. I ran 30k on Sunday & maintained perfect blood sugar levels all day. Low carb sucks when you're active & insulin dependent IMO.

teacher123 said:

Wow - I never realised that. Surely a different insulin would be much better if that's the case. I took NV about 2pm, walking home at 8pm. Surely would have been exhausted by then?

Will reduce basal a little and see what happens.

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Right then, you are encountering the not so fast acting effect of "Fast acting insulin". There's a reason why some call it "Slovorapid". Basically, all the short acting insulins - Humalog, Apidra and Novorapid peak at about 90 mins but have a tail that can last up to five or six hours. For me it tends to be out of my system in around four.

But you also need to look at your running. Paul Coker does a lot of long distance running and struggles with hypos eating low carb when he exceeds his aerobic threshold. Some are able to run on low carb with next to no issues at all, but find they have to adjust their basal to do so.

It's going to be a case of record, review react for you in this case I think. If you try not taking your lunchtime insulin, or reducing it to a half unit, and then seeing how your bg is affected by your run, you are likely to get a better picture of the pattern.

I agree that I think what you are experiencing is related to your exercise. You can have minimal to practically zero circulating insulin and experience a fairly rapid fall in BGs. This is related to enhanced insulin sensitivity (it's actually a bit misleading to call it this because it's actually more of an 'effectiveness to absorb glucose') for up to 24 and even up to 48hrs after a bout of exercise.

When you exercise, the GLUT4 transporters in your muscles (they are responsible for enabling the transport of most of the glucose out of your blood and into the muscles) ploriferate and mobilise so that they are primed and ready to help transport glucose into the cells. GLUT4's are pretty cool in that they can be mobilised by both insulin and also through muscle contraction.
If you've done a decent bout of exercise (and particularly if you are low carb) it takes very little additional 'exercise' for your BGs to begin falling again, because the GLUT4's are still active. Walking is enough exercise to stimulate glucose uptake again, but not enough to get your heart pumping and illicit a counter glucose release from the liver. This is going to happen if your muscle glycogen stores haven't yet been replenished.

It's good advice to monitor and reduce insulin if required, but also consider how much carb you are likely to have 'burned' and what 'deficit' you are likely to have after exercise. Matching this with a reduced bonus could possibly be the answer.