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Moderate- and High-Speed Treadmill Running Exercise Have Minimal Impact on Rat Achilles Tendon.

Margaret K Tamburro1,2, Kelsey A Bonilla1, Snehal S Shetye1

  • 1McKay Orthopaedic Laboratory, University of Pennsylvania, Philadelphia, Pennsylvania, USA.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
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PubMed
Summary

Treadmill running had minimal impact on rat Achilles tendons, showing only slight changes in tenocyte metabolism and tendon properties. This study suggests current animal models may not fully capture exercise-induced tendon adaptations or pathologies.

Keywords:
Achilles tendonbiomechanicsexercisekinematics and kineticsmechanobiology

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Area of Science:

  • Biomedical Engineering
  • Sports Science
  • Orthopedics

Background:

  • Achilles tendon health is influenced by exercise in humans, but suitable animal models are scarce.
  • Previous studies on treadmill running's effects on rat Achilles tendons yield inconsistent results.

Purpose of the Study:

  • To evaluate the functional, structural, cellular, and biomechanical effects of treadmill running on rat Achilles tendons.
  • To investigate if moderate or high-speed running induces beneficial or pathological changes in the Achilles tendon.

Main Methods:

  • Rats underwent 8 weeks of treadmill running at control, moderate (10 m/min), or high (20 m/min, 10° incline) speeds.
  • Sensitive in vivo and ex vivo approaches were used to assess tendon characteristics.
  • Evaluated tenocyte cellularity, metabolism, differentiation, and biomechanical properties.

Main Results:

  • Treadmill running showed a nominal effect on the rat Achilles tendon.
  • Modest influences were observed in tenocyte metabolism and nuclear aspect ratio.
  • Viscoelastic tendon properties were slightly altered, but no tendinopathic phenotype developed.

Conclusions:

  • Treadmill running at tested speeds did not induce a tendinopathic phenotype in rat Achilles tendons.
  • Findings indicate a need for enhanced animal models to study exercise-related tendon changes.
  • Improved models are crucial for developing effective tendinopathy prevention and treatment strategies.