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Related Experiment Videos

Tendon conditioning: artefact or property?

Constantinos N Maganaris1

  • 1Centre for Biophysical and Clinical Research into Human Movement, Manchester Metropolitan University, Alsager ST7 2HL, UK. c.n.maganaris@mmu.ac.uk

Proceedings. Biological Sciences
|September 4, 2003
PubMed
Summary
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Tendons exhibit

Area of Science:

  • Biomechanics
  • Musculoskeletal Research

Background:

  • Tendons show 'conditioning'—increasing elongation under cyclic loads.
  • This phenomenon's nature (artefact vs. property) is debated.

Purpose of the Study:

  • To determine if tendon conditioning is a measurement artefact or a genuine time-dependent property.
  • To investigate the conditioning behavior of gastrocnemius tendons in humans.

Main Methods:

  • Cyclic loading of gastrocnemius tendons from six male participants (10 contractions at 80% MVC).
  • Sonographs analyzed to measure tendon elongation during activation and residual elongation post-relaxation.
  • Participants refrained from rigorous activity before the experiment.

Main Results:

Related Experiment Videos

  • Tendon elongation and residual elongation increased by approximately 5 mm from contraction 1 to 10.
  • Significant changes in elongation occurred within the first five contractions.
  • No further changes in elongation were observed after the fifth contraction.

    • Conclusions:

    • Tendon conditioning is a relevant, time-dependent biological property, not an artefact of in vitro testing.
    • Conditioning affects joint kinematics and muscle excursion.
    • Findings highlight the importance of considering tendon conditioning in biomechanical analyses.