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Easy Illustration of Muscle Fibre Types
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NEUROMMUSCLAR SYSTEM
Muscle fibers are innervated by motor neurons that transmit impulses in the form of electrochemical signals from the spinal cord to muscle. A motor neuron generally has numerous terminal branches at the end of its axon and thus innervates many different muscle fibers. The whole structure is what determines the muscle fiber type and its characteristics, function, and involvement in exercise.
Skeletal muscles are composed of fibers that have markedly different morphological and physiological characteristics. These differences have led to several different systems of classifications, based on a variety of criteria.
The most familiar approach is to classify fibers according to twitch time, employing the terms:
- Fast Twitch Fibers
- Slow Twitch Fibers
DEFINITIONS:
- Fast Twitch Fibers: A fast twitch motor unit is one that develops force and also relaxes rapidly and thus has a short twitch time.
- Slow Twitch Fibers: A slow twitch motor unis develops force and relax slowly and have a long twitch time.
Note: Information obtained from NSCA.
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Muscle fibers are innervated by motor neurons that transmit impulses in the form of electrochemical signals from the spinal cord to muscle. A motor neuron generally has numerous terminal branches at the end of its axon and thus innervates many different muscle fibers. The whole structure is what determines the muscle fiber type and its characteristics, function, and involvement in exercise.
Skeletal muscles are composed of fibers that have markedly different morphological and physiological characteristics. These differences have led to several different systems of classifications, based on a variety of criteria.
The most familiar approach is to classify fibers according to twitch time, employing the terms:
- Fast Twitch Fibers
- Slow Twitch Fibers
DEFINITIONS:
- Fast Twitch Fibers: A fast twitch motor unit is one that develops force and also relaxes rapidly and thus has a short twitch time.
- Slow Twitch Fibers: A slow twitch motor unis develops force and relax slowly and have a long twitch time.
Note: Information obtained from NSCA.
WATCH THE VIDEO FOR A BETTER VISUAL UNDERSTANDING.
Don't forget to like, comment and subscribe to my channel for more fitness knowledge. :)
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