Hi Courtney - @chamm, even after living with insulin injections / infusions for over 60 years and living an active life, some say “too active”, I can still be taken by surprise by either “high” or “low” following some activities. and sometimes several hours [6 to 10] after the activity is completed my BG will drop suddenly and significantly. There are a few explanations for this:
- Our bodies are not [yet?] programed as robots;
- Aerobic exercise will generally help lower BG levels;
- Anaerobic exercise will more often cause BG levels to rise - the stress put on the body will signal the liver saying “muscles need food” and the body will get flooded with glucose / glucagon;
- Residual insulin [active insulin] from a previous bolus can, depending on activity level’ either keep your glucose level [anaerobic exercising] or cause glucose levels to drop, sometimes VERY suddenly.
Personally, I can not always anticipate or recognize when my exercise morphs from what I intended to be a light - moderate workout to a full blown anaerobic experience. My solutions, in the past I set a timer [such as a bike tracker] so I’d stop and do a fingerstick; now, I set alerts on my CGM to let me know audibly when I’m going up or down at certain rates.
Before any exercise I set my pump at a percentage level of less than 100% and when I notice that my exercise level has reached anaerobic, I cancel the temporary reduced basal; if my BGL is dropping I will suspend my pump and eat - my preferred snack for this drop is a protein granola bar loaded with nuts and dark chocolate. My bars give an initial sugar jolt and plenty of prolonged glucose; I also carry a couple of juice boxes in my bag, just in case.