Researchers from Tokyo Metropolitan University have discovered that a protein excreted by type I (slow) muscle fibers, key to muscle endurance, can cause surrounding myoblasts to differentiate into type I fibers. This upends prevailing wisdom which says our fast/slow fiber ratio can’t be significantly changed. They also identified the chemical pathway by which the protein affects differentiation. Such findings may one day lead to therapies to control slow muscle health.
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Source: Phys.org