Originally Posted by
smashndash
I’ve heard (bro science most likely) that at a certain force threshold, your muscles cannot continuously contract to deliver that force. Instead, they rapidly twitch. This is extremely inefficient and causes huge amounts of fatigue.
This is true at any force. Different fibers cycle through contraction and relaxation. The greater the force, the more fibers are contracting at the same time. Similarly, at any force or tension, all fiber types are activated with the ratio changing based on the force and contraction speed required.