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Related Experiment Videos

Active tension generation in isolated skeletal myofibrils

M L Bartoo1, V I Popov, L A Fearn

  • 1Center for Bioengineering, University of Washington, Seattle 98195.

Journal of Muscle Research and Cell Motility
|October 1, 1993
PubMed
Summary

Isolated myofibrils from rabbit muscle generated high active tension, comparable to larger muscle preparations. This study demonstrates their utility for investigating muscle contraction mechanics.

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Area of Science:

  • Muscle physiology
  • Biomechanical research

Background:

  • Understanding muscle contraction mechanics is crucial for diagnosing and treating muscle-related disorders.
  • Previous research has primarily focused on whole muscle fibers, limiting detailed analysis of individual contractile units.

Purpose of the Study:

  • To investigate the mechanical properties of isolated myofibrils from rabbit psoas muscle.
  • To assess the reproducibility, calcium sensitivity, and tension output of single and double myofibrils.
  • To compare the tension generated by myofibrils to that of larger muscle fiber preparations.

Main Methods:

  • Isolation of single or double myofibrils from rabbit psoas muscle.
  • Suspension of myofibrils between a force transducer and needle for mechanical testing.
  • Measurement of individual sarcomere lengths using a photodiode array.

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  • Activation and relaxation cycles to assess contractile function and durability.
  • Varying calcium concentrations (pCa) to determine calcium sensitivity.

    • Main Results:

    • Isolated myofibrils exhibited reproducible active tension and comparable passive length-tension curves to larger specimens.
    • Contractile response was dependent on initial sarcomere length, with homogeneous contractions observed at shorter lengths.
    • Calcium sensitivity was similar to larger preparations, with full activation at pCa 5.5-4.5.
    • Mean active tension at full filament overlap was 0.59 N mm⁻², higher than reported for fiber preparations.

    Conclusions:

    • Isolated myofibrils are viable preparations for studying muscle contraction mechanics at the sarcomere level.
    • Myofibrils demonstrate high tension output per cross-sectional area, exceeding that of larger muscle fibers.
    • This model system offers a powerful tool for detailed biomechanical analysis and understanding muscle function.