I do the shaky thing too, but I think it is just psychological tbh. At calorie crash levels of no blood sugar during extreme endurance sports, it is totally different. It is like someone straps lead weights all over your body. Everything feels heavy and nearly impossible to move.

There is probably some kind of dynamic regarding different types of sugar in the system that cause the shakiness.

Your brain ONLY works on sugars. So calorie crashing, like hitting the wall, is when your body has to start cannibalizing your own muscles for sugar to fuel the brain. I’ve never been anywhere near that level except on a bike after 4+ hours and 60+ miles. You feel like a puddle, and joints are like bending copper wire. There is no shakiness in that state.