Difference between fast twitch and slow twitch muscle fibers?

Question

What is the difference between slow-twitch fatigue resistant, slow twitch fatigable, fast twitch fatigable and fast twitch fatigue resistant muscle fibers in terms of their physiology.

Answer 1

Muscle fibers vary in contraction speed, and whether they produce ATP oxidatively or glycolotically. Three combinations of these characteristics are found in humans, slow twitch fibers are always ioxidative and are therefore resistant to fatigue. Fast twitch fibers may be primarily glycolytic (fatigable) or primarily oxidative (fatigue resistant)
(skipping the slow twitch paragraph)
Fast-twitch glycolytic fibers are also called white fibers because they have less myoglobin (oxygen carring molecule like hemoglobin, but only in muscles), and have a poorer blood supply than red fibers. They include fibers in certain hand muscles as well as in muscles that move the eye.....

A third kind of fiber, they fast twitch fatigue-resistant fiber are also intermediate fibers. These fibers have the fast-twitch speed associated with white fibers combined with a substantial oxidative capacity more characteristic of red fibers.....

While some muscles have mostly one fiber type, all muscles include a combination of fiber types. The speed of contraction and aerobic capacities of the fibers reflect the specialized functions of the muscle.

Answer 2

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