Portland Fitness Trainer | Fast Twitch and Slow Twitch Muscle
So what is the difference between fast twitch and slow twitch muscle fibers? In basic terms, fast twitch muscle fibers are involved in activities where the muscle will contract a lot in a shorter period of time, which will cause it to fatigue rapidly. These activities include very fast sprinting, short bursts of quick energy, quick power lifting moves, and running back plays like in football.
When looking at slow twitch muscle fibers, these types of contractions are a lot slower, but the endurance of the muscle can last a lot longer versus fast twitch. The muscle will keep contracting without fatiguing as quickly as its counterpart.
To get a better idea of what these muscles look like in other animals, lets look at the chicken. When you are having chicken, some people prefer the dark or white meat. The dark meat is composed of more slow twitch muscle fibers (has more fat in it for long lasting energy), and the white meat is composed of fast twitch muscles fibers (quick bursts of energy).
Everyone has a different make up of fast twitch and slow twitch muscle fibers and utilizing different ones an recruiting different types will be another post. Above are the basic components of this types of muscle fibers and if you want to get more in depth, I would suggest reading an exercise physiology book to learn more about this.