An olympic runner likely has a larger proportion of which kind of fibers in his/her legs compared to the average person?

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11-08-2022
Biology

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An olympic runner likely has a larger proportion of which kind of fibers in his/her legs compared to the average person?

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tripatsingh039 tripatsingh039 · Answer 1 · 2022-08-17T06:54:22+02:00

Olympic runners have been shown to possess about 80% fast-twitch muscle fibers while those who excel in marathons tend to have 80% slow-twitch fibers. Muscle Fiber type is part of a great athlete's success, but it alone is a poor predictor of performance.

The Olympic runner's leg muscle had a high abundance (24%) of the pure MHC IIx muscle fibers with a total fast-twitch fiber population of 71%. Power output of the MHC IIx fibers was 2-fold higher than MHC IIa fibers and 14-fold greater than MHC I fibers. Additionally, the MHC IIx fibers were highly responsive to intense exercise at the transcriptional level for genes involved with muscle growth and remodeling. To our knowledge, the abundance of pure MHC IIx muscle fibers is the highest observed in an elite Olympic runner.

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