An unusual experience following heavy exercise

Yesterday evening, I undertook a training session that was extremely difficult and really pushed me to the edge of what I could do. It was a resistance session on my legs. Halfway through it I found that I was feeling dehydrated and swallowed a litre of water straight down (this was after consuming 4l during the day), and it properly pushed me to the point where I was retching. It was tough. By the end I had a classic tension headache and was exhausted.

Fast forward to today and I've been drinking water like it went out of fashion (and not excreting it). i was clearly dehydrated after all the exertion. What's been far more odd has been my insulin reaction. My diet today has been no different from normal, and yet I've needed to bolus at least twice as much insulin to deal with protein. It's been a real challenge to get my BG levels to fall to where I want them. My insulin response has just been terrible. My diet between the two days has been the same, with limited carbs, mostly made up of fats and proteins. So it shouldn't be a dietary thing.

After a physically demanding session (of whatever it might be) has anyone else experienced what appears as decreased insulin sensitivity like this?

Well, to follow this up, I also posted it on the Facebook sporty type1 diabetics group. It didn't really answer the question and caused a fight with a t1 RN over whether ketones are dangerous. Just goes to show that LC and ketosis are not widely understood even within the diabetes community globally.

On a different note, I am almost completely sure that the reasons for my issues yesterday were my body trying to replenish glycogen in my leg muscles.

I base this off my overnight basal response which in normal circumstances would be reasonably flat and last night showed a significant decline.

Oh well, you live and you learn...

Further info from others today also suggested that extreme intensity exercise can cause something similar to SIMS which is a critical care issue (worth googling). Extreme muscle damage and glycogen depletion leads to additional inflammation which reduces the efficiency of the immune system and causes a reaction in diabetics similar to illness, ie bg levels are increased and it should be treated like a sick day.

@Mrs Vimes, I have, and that should have occurred to me. Thanks for the reminder. And thanks for introducing yourself on here!