What Are Muscle Fiber Ratios?

The muscles in our bodies are comprised of several different types of fibers. They are generally lumped into two broad categories - slow twitch and fast twitch. The number of slow to fast in a particular muscle is referred to as a muscle's fiber ratio. The number before the slash refers to the percentage of slow twitch; the number after the slash fast twitch. For example, a common Trapezius ratio is 53.7/46.2.

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