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Runblogger Runcast #11: Muscle Fiber Types (Slow-Twitch vs. Fast-Twitch) and Athletic Potential

Posted on February 20 2010

You’ve probably heard of the phrases slow-twitch and fast-twitch – these terms refer to different types of fiber that we have in our muscles, The fiber makeup that each of us has in our muscles is somewhat variable, and is largely determined through genetic inheritance from our parents.  Perhaps most importantly for runners, fiber type makeup has the potential to influence your potential for success in races of different distance (e.g., 5K vs. marathon).  This episode discusses the topic of fiber types in muscles, how they differ physiologically, and how this relates to athletic potential and performance.

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To see a picture of a muscle biopsy stained for the different fiber types: click here.

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