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Skeletal Muscle Fiber Types
5
Skeletal Muscle Fiber Types
Bridgett Rayhill
Muscle Fiber Types
Fibers
There are three types,
1. Slow Oxydative (SO)
2. Fast Oxidative (FO)
3. Fast Glycolytic (FG)
There are 2 fast twitch fibers, and 1 slow twitch fiber
There are 2 fast twitch fibers, but only one slow twitch fiber.
Slow Oxidative (SO)
Slow
This is the slow twitch fiber. This means that fire slowly, and are utilized during aerobic respiration. SO fibers are used during long spurts of exercise. They can do this with out fatigue.These fibers are not ideal for power/fast exercises that need a lot of energy produced.
Slow and steady wins the race
Examples of when these fibers are used is like during a race. They will be firing and keeping the person going so they can hopefully win.
Fast Oxidative (FO)
Fast
These are the fibers that are between the fast fibers and the slow fibers, so the are know as the "intermediate fibers". They are in the middle because they don't fatigue as quickly as the FG fibers, but don't last as long as the SO fibers. They are more explosive than the SO fibers, but still aren't used when doing power exercises.
Stuck in the middle with you.
Walking is an example of a movement that uses these fibers. These fibers are used for movements that require more energy postural control, but less energy than explosive movements, like jumping or sprinting.
Fast Glycolytic (FG)
Fast
This is the fiber that uses the anaerobic glycolysis for their ATP source. This means that they can produce a lot of high tension in a short amount of time. This type of muscle fiber can only work for a short amount of time because they fatique quicker than the other two types of fibers.
We've got the power!
These are used more in short, powerful motions. An example is a lift of some sort. A powerlift for example, is involves a lot of power and energy in a short amount of time.
Where I got my info.
Wrap Up
OpenStax. (2013, March 06). Anatomy and Physiology. Retrieved from https://opentextbc.ca/anatomyandphysiology/chapter/10-5-types-of-muscle-fibers/