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The Human Phenotype Ontology (HPO) is downloaded weekly from The file downloaded is considered the "last stable build" available for the ontology. For more about the HPO, view their website at

Term:Abnormal muscle fiber-type distribution
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Accession:HP:0033684 term browser browse the term
Definition:Ay deviation from the normal distribution of fiber types in skeletal muscle. The skeletal muscle groups of the mammalian body are made up of bundles of muscle fibers. These fibers can be assigned to different Types, with characteristic movement rates, response to neural inputs, and metabolic styles. Skeletal muscle fibers are broadly classified as slow-twitch (type 1) and fast-twitch (type 2). Multiple fiber types are generally intermingled within a single muscle group, and different muscle groups have varying proportions of fiber types

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  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of the musculoskeletal system 0
        Abnormality of the musculature 0
          Abnormal skeletal muscle morphology 0
            Abnormal muscle fiber morphology 0
              Abnormal muscle fiber-type distribution 0
                Fiber type grouping 0
                Type 1 muscle fiber predominance 0
                Type 2 muscle fiber predominance 0
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