Fast-twitch fibers

Fast-twitch fibers are muscle fibers that contract quickly and powerfully but fatigue rapidly. They are crucial for explosive movements like sprinting or jumping. These fibers rely on anaerobic metabolism, making them less efficient for endurance activities. Sprinters and power athletes have a higher proportion of fast-twitch fibers, enhancing their performance in short, intense efforts. Training can increase the efficiency and size of these fibers, improving speed and power. Understanding fast-twitch fibers helps runners tailor their training for specific goals, such as improving sprint speed or explosive strength, which is essential for races requiring bursts of speed.