Fast-twitch Muscle Fibers

Fast-twitch muscle fibers are a type of muscle cell designed for quick and powerful movements. They contract rapidly and generate a lot of force, making them essential for activities like sprinting, jumping, or heavy lifting. However, they fatigue faster than slow-twitch fibers because they rely primarily on anaerobic energy sources, which provide quick bursts of energy but exhaust quickly. These fibers are less efficient for endurance activities but excel in short, intense efforts, contributing to explosive strength and speed.