About The Medical Condition White Muscle Fiber
Find the definition of the medical term White Muscle Fiber. White Muscle Fiber defined and explained for easy understanding at the Medical Conditions from ClusterMed.info.
White Muscle Fiber
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What's The Definition Of The Medical Condition White Muscle Fiber?
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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