FAST TWITCH MUSCLE FIBERS
\fˈast twˈɪt͡ʃ mˈʌsə͡l fˈa͡ɪbəz], \fˈast twˈɪtʃ mˈʌsəl fˈaɪbəz], \f_ˈa_s_t t_w_ˈɪ_tʃ m_ˈʌ_s_əl f_ˈaɪ_b_ə_z]\
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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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sir richard blackmore
- An English physician poet; born in Wiltshire about 1650; died 1729. Besides medical works, Scripture paraphrases, satirical verse, he wrote Popian couplets "Prince Arthur, a Heroic Poem"(1695), and voluminous religious epic, "The Creation"(1712), very successful much praised then, but not now read.
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