About The Medical Condition Muscle Fibers, White

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Muscle Fibers, White

Muscle Fibers, White Medical Condition Defined & Explained
Muscle Fibers, White Medical Condition

What's The Definition Of The Medical Condition Muscle Fibers, White?

Skeletal muscle fibers having high myofibrillar ATPase activity, high glycolytic enzyme activities, and an intermediate glycogen content which produce a fast twitch. There are two types. Fast fatigable fibers, also called white fibers, have a low myoglobin content, and a small mitochondrial content, and fatigue rapidly due to their limited glycogen content and low capacity for oxidative metabolism. Fast fatigue-resistant fibers, also called red fibers, have a large mitochondrial content and a high myoglobin content, related to their resistance to fatigue. (From Best, Physiological Basis of Medical Practice, 12th ed, p100)

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