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The other thing about going to the gym first thing is that you may experience dawn phenomenon, which, combined with any glucose requirement of the muscles, will add to the blood glucose increase.The only way of knowing how to adjust your insulin is trial & error. My blood sugars shoot up sky high after a workout which I couldn't get my head around as its always been drummed in to me that exercise = low sugar levels. I don't know how to explain it in scientific words so someone correct me if I'm wrong, but because I go to the gym in the morning on an empty stomach, I wasn't giving insulin as I wasn't having food, it's something to do with when you exercise, your muscles need more glucose to supply energy. In response, your liver increases the amount of glucose it releases into your bloodstream. Obviously on waking & going straight the gym, my body didn't have enough insulin to cope with the extra glucose my liver was making to supply me with energy for my workout so was actually raising my blood sugars. I spoke to my Diabetes team about it who have programmed it into my blood meter for me to take exercise into account so it just tells me how much insulin I should take for my exercise. Hope this makes a bit of sense.
Our bodies normally work in a homeostatic system, and therefore trigger the various cells to do things. On waking, we release glucose, and trigger insulin release. On using muscles for anaerobic exercise, we release glucose and trigger insulin. Our body can't tell whether we are high or low, just whether the organs requiring the glucose have enough, and if they don't we try and do something about it. Unfortunately, the triggers don't result in any action!
Interestingly, the research that has been done at Swansea suggests that the best order for Aerobic and Anaerobic in order to best manage BG levels is to undertake Aerobic exercise first, configuring the muscles to lower blood glucose levels, with Anaerobic at the end to cause the hyper glycaemic lift countering the low creating effects of the aerobic exercise.The weights can really raise blood sugar if you lift very heavy. Then cardio can bring it down again if you do it for long enough.
In addition, the testing they've done on Anaerobic exercise is also quite interesting. In a Superset programme, made up of four sub-programmes done "A/B" then "C/D", if these are done as two sets of reps per programme, then hyperglycaemia occurs post exercise. If done as 3 sets or more, then blood glucose drops and stabilises due to muscles sucking in the liver dumped glucose in the later sets.