Which Twitch?

By Riva Preil The pelvic floor muscles are composed of two different types of muscle fibers which can be thought of as two “speeds.” Approximately 70% of the pelvic floor muscle fibers are slow-twitch or slow-contraction fibers. The remaining 30% are fast-twitch fibers. The slow twitch fibers fuel endurance. They are the marathoners of muscles, …

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