Transitioning from slow-twitch to fast-twitch muscle fibers during exercise is associated with increased CO2 production, lactate, and a need for greater buffering capacity.

“you're you're you're you need to breathe much faster because you're producing more CO2 and that's probably because you're already transitioning from the slow twitch musle fibers to the fast twitch muscle fibers more glycolytic more lactate more CO2 more buffering capacity”