Hi @josephazimmer. Welcome to FUD! You are in the right place.
Before I get into pump or basal specifics, I think it’s helpful to have a little overview of how our bodies fuel exercise.
Our bodies have several different ways to “create” energy (ATP) which is used to allow the muscle to contract. (Of course we don’t actually “create” it, it simply changes form.)
The primary ones we talk about for exercise are glycolysis (carbohydrates) and the Krebs cycle (fat metabolism). There are others, but those are the main ones that keep us moving.
All of those systems are always working together, but in different amounts. You don’t completely switch from one to the other as you increase or decrease your intensity, but the percentage of the contribution of each source changes.
Carbohydrates are a very efficient source of fuel because the body requires less oxygen to burn carbohydrate compared to fat.
Fat is not as efficient, but is more abundant. Fat provides a bigger amount of available energy compared to carbs (9 calories per gram of fat versus 4 calories per gram of carbohydrate). It helps fuel lower intensity efforts, and we have much more of it compared to stored carbs, but it requires more oxygen. And it also takes longer for this fuel source to be ramped up.
An easy way to think of this is how you can walk without breathing hard, and you can walk farther than you can run, but you can run faster. And running means you will be breathing harder.
One other thing to mention about carbs - they can be stored in your muscles (muscle glycogen), but those stored carbs can never raise your blood sugar. Ever. Once they are stored as muscle glycogen, the only thing they can do is provide energy for the muscles where they are stored. (Muscle glycogen is never shared). But carbs that are recently eaten can either provide energy for exercise or raise your blood sugar.
So the most important thing to understand is that the fastest way for your body to get energy is from stored carbs (muscle glycogen) or from your blood sugar.
Okay, so all of that is just a little background on fueling. I can get to the fixes for your BG drops in my next post, but wanted to just give a little overview of that to start with. Let me know if all of that makes sense.