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Tissue Triage and Freezing for Models of Skeletal Muscle Disease
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How does tissue preparation affect skeletal muscle transverse isotropy?

Benjamin B Wheatley1, Gregory M Odegard2, Kenton R Kaufman3

  • 1Department of Mechanical Engineering, Colorado State University, Fort Collins, CO, USA.

Journal of Biomechanics
|July 19, 2016
PubMed
Summary

Post mortem handling significantly affects skeletal muscle

Keywords:
Constitutive modelingMaterial testingMechanical propertiesRigor mortis

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Area of Science:

  • Biomechanics
  • Biomaterials Science
  • Muscle Physiology

Background:

  • Skeletal muscle passive tensile properties are vital for physiological function.
  • Conflicting reports exist regarding muscle transverse isotropy, impacting constitutive models.
  • Accurate models are crucial for clinical recommendations and observations.

Purpose of the Study:

  • To investigate the influence of post mortem handling on transversely isotropic tensile muscle properties.
  • To determine how testing conditions affect muscle stiffness and relaxation behavior.

Main Methods:

  • Tibialis anterior muscles from Giant Flemish rabbits were tested.
  • Muscles were divided into fresh (within 4 hours) and non-fresh (delayed/freeze-thaw) groups.
  • Longitudinal and transverse samples were analyzed for tensile modulus and relaxation.

Main Results:

  • Non-fresh longitudinal samples showed higher initial modulus and faster relaxation than fresh samples.
  • Fresh longitudinal samples were less stiff at low strains but exhibited more nonlinear behavior.
  • Fresh muscle demonstrated a higher transverse modulus than longitudinal modulus.

Conclusions:

  • Post mortem handling significantly alters skeletal muscle's passive tensile properties.
  • Discrepancies in prior research may stem from experimental protocol variations.
  • Constitutive models for fresh muscle should acknowledge true transverse isotropy.