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Temporary tendon strengthening by preconditioning.

Atsushi Teramoto1, Zong-Ping Luo

  • 1Sports Medicine Research Center, Department of Orthopedic Surgery, Baylor College of Medicine, 6550 Fannin St., Suite 451, Houston, TX 77030, USA.

Clinical Biomechanics (Bristol, Avon)
|January 15, 2008
PubMed
Summary
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Preconditioning tendons with stretching for 30 to 600 seconds enhances their mechanical strength. Longer stretching durations, however, do not provide additional benefits for tendon strengthening.

Area of Science:

  • Biomechanics
  • Sports Medicine
  • Tendon Research

Background:

  • Tendon injuries are common in sports, with pre-activity stretching often recommended.
  • Stretching is known to reduce muscle stiffness and increase range of motion.
  • The optimal duration of preconditioning for tendon strengthening remains undefined.

Purpose of the Study:

  • To investigate the time-dependent effects of preconditioning on tendon mechanical strength.
  • To determine the optimal duration of stretching for enhancing tendon properties.

Main Methods:

  • Forty-eight rat Achilles tendons were divided into six groups.
  • One control group received no preconditioning.
  • Five groups underwent preconditioning via stretching at 2% strain for durations of 30, 100, 300, 600, or 1000 seconds before testing to failure.

Related Experiment Videos

Main Results:

  • Preconditioning durations from 30 to 600 seconds significantly increased ultimate failure load and strength compared to the control group.
  • No significant difference in ultimate failure load or strength was observed between the control group and the 1000-second stretching group.
  • Specific P-values indicate significant increases in mechanical properties for shorter preconditioning times.

Conclusions:

  • The time-dependent effects of preconditioning on tendon mechanical strength are evident.
  • Optimal tendon strengthening through preconditioning occurs within a specific time window (30-600 seconds).
  • Micro-level mechanisms involving collagen fiber recruitment and fatigue may explain these time-dependent changes.