The CO‐dispersion index for the measurement of fiber type distribution patterns

James M. Lester, Dennis I. Silber, Michael H. Cohen, Robert P. Hirsch, Walter G. Bradley, John F. Brenner

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


There is a need for a practical and statistically manageable quantitative index of fiber type co-dispersion in skeletal muscle to allow investigation of the distribution of motor units in normal muscle and their rearrangement in pathological states. A new measure for this purpose, the Co-Dispersion Index (CDI), is introduced. This measure is based on contingency table analysis of nearest-neighbor relationships between muscle fibers. The CDI has a continuous range of values from -1 to +1, in which large negative values indicate a greater tendency toward regular intermixing of fibers of different types, and larger positive values of greater segregation of fiber types. CDI evaluation overcomes the limitations of previously published quantitative methods for codispersion measurement and is well correlated with subjective human estimates of fiber type grouping.

Original languageEnglish (US)
Pages (from-to)581-587
Number of pages7
JournalMuscle & Nerve
Issue number8
StatePublished - Oct 1983
Externally publishedYes

ASJC Scopus subject areas

  • Physiology
  • Clinical Neurology
  • Cellular and Molecular Neuroscience
  • Physiology (medical)


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