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Biomechanical Testing of Murine Tendons
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Structural and Functional Properties of Lower Extremity Tendons in Men.

Brett A Comstock1, Shawn D Flanagan2, Craig R Denegar3

  • 1Department of Health and Exercise Science, Bloomsburg University, Bloomsburg, Pennsylvania.

Journal of Strength and Conditioning Research
|November 4, 2024
PubMed
Summary

Heavy resistance training increases lean body mass and bone density in men. Tendon adaptations vary between the patellar and Achilles tendons, with no clear link to blood biomarkers.

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Area of Science:

  • Sports Medicine
  • Exercise Physiology
  • Biomechanical Engineering

Background:

  • Understanding tendon adaptations to resistance training is crucial for optimizing performance and injury prevention.
  • Previous research indicates varied responses in connective tissues to mechanical loading.
  • The role of systemic biomarkers in mediating tendon changes remains unclear.

Purpose of the Study:

  • To compare structural and functional tendon properties between resistance-trained (RT) and recreationally active (NR) young men.
  • To assess differences in body composition (lean body mass and bone mineral density) between groups.
  • To investigate the relationship between serum collagen turnover markers and tendon/bone adaptations.

Main Methods:

  • Ultrasonography and dynamometry were used to measure patellar and Achilles tendon properties at rest and during maximal voluntary isometric contractions.
  • Dual-energy X-ray absorptiometry assessed lean body mass and bone mineral density.
  • Serum samples were analyzed for collagen turnover markers.

Main Results:

  • Resistance-trained men exhibited significantly greater lean body mass and bone mineral density compared to the control group.
  • Patellar tendon stiffness and Young's modulus were significantly higher in RT men, but cross-sectional area did not differ.
  • Achilles tendon cross-sectional area was larger in RT men, yet stiffness and modulus showed no significant differences between groups.

Conclusions:

  • Heavy resistance training enhances lean body mass and bone mineral density in young men.
  • Tendon adaptations to resistance training are differential, affecting the patellar and Achilles tendons differently.
  • Serum collagen turnover markers did not correlate with tendon or bone adaptations, suggesting limited involvement in these specific changes.