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Fast-twitch 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).
Source: MESH OBO (Open Biomedical Ontologies)
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Source - MeSH OBO (Open Biomedical Ontologies)
The following list attempts to classify Fast-twitch muscle fiber into categories where each line is subset of the next.
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