Axial strain measurements in skeletal muscle at various strain rates

T. M. Best, J. H. McElhaney, W. E. Garrett, B. S. Myers

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


A noncontact optical system using high speed image analysis to measure local tissue deformations and axial strains along skeletal muscle is described. The spatial resolution of the system was 20 pvcels/cm and the accuracy was ± 0.125mm. In order to minimize the error associated with discrete data used to characterize a continuous strain field, the displacement data were fitted with a third order polynomial and the fitted data differentiated to measure surface strains using a Lagrangian finite strain formulation. The distribution of axial strain along the muscle-tendon unit was nonuniform and rate dependent. Despite a variation in local strain distribution with strain rate, the maximum axial strain, Exx = 0.614 ± 0.045 mm/mm, was rate insensitive and occurred at the failure site for all tests. The frequency response of the video system (1000 Hz) and the measurement of a continuous strain field along the entire length of the structure improve upon previous noncontact optical systems for measurement of surface strains in soft tissues.

Original languageEnglish (US)
Pages (from-to)262-265
Number of pages4
JournalJournal of biomechanical engineering
Issue number3
StatePublished - Aug 1995
Externally publishedYes

ASJC Scopus subject areas

  • Biomedical Engineering
  • Physiology (medical)


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