What is the difference between fast-twitch and slow-twitch muscle fibers? Is it possible to change your ratio of fast-twitch to slow-twitch muscle fibers through training? Fast-twitch muscle fibers support explosive muscle activity (e.g., lifting heavy objects or sprinting short distances), while slow-twitch muscle fibers support activities requiring endurance (e.g., long-distance running). To some degree, we can train our fast-twitch muscles to have more endurance and our slow-twitch muscles to become stronger, but we cannot actually change the ratio of slow-twitch to fast-twitch fibers that we are born with. Here’s how fast-twitch and slow-twitch muscle fibers impact sports.
Fast-Twitch and Slow-Twitch Muscle Fibers in Sports
