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

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 listen or subscribe via Itunes: http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewPodcast?i=80594539&id=348528478

Alternatively, you can listen directly here:


Links related to Runcast #11:

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

About Peter Larson

This post was authored by Peter Larson. Pete is a recovering academic who currently works as an exercise physiologist, running coach, and writer. He's also a father of three and a fanatical runner with a bit of a shoe obsession. In addition to writing and editing this site, he is co-author of the book Tread Lightly, and writes a personal blog called The Blogologist. Follow Pete on Twitter, Facebook, Google+, and via email.

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