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Gauging force by tapping tendons.

Jack A Martin1, Scott C E Brandon2,3, Emily M Keuler2

  • 1Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI, 53706, USA.

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|April 25, 2018
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Summary
This summary is machine-generated.

Researchers developed a non-invasive method to measure muscle-tendon forces by tracking shear wave speed in tendons. This technique offers new insights into human movement biomechanics and could aid in treating musculoskeletal injuries.

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Area of Science:

  • Biomechanics
  • Musculoskeletal Science
  • Human Movement Analysis

Background:

  • Accurate assessment of muscle-tendon forces is crucial for understanding human movement.
  • Current methods for measuring muscle-tendon loads are invasive or rely on numerous assumptions.
  • A non-invasive technique is needed to evaluate in vivo muscle-tendon loading.

Purpose of the Study:

  • To introduce and validate a non-invasive method for assessing tendon loads.
  • To investigate the relationship between shear wave propagation speed and axial stress in tendons.
  • To demonstrate the feasibility of tracking in vivo tendon wave speeds during various physical activities.

Main Methods:

  • Established the relationship between shear wave speed and axial stress in tendons.
  • Developed a shear wave tensiometer using micron-scale taps and skin-mounted accelerometers.
  • Tracked tendon wave speeds in vivo during isometric exertions, walking, and running.

Main Results:

  • Shear wave propagation speed in tendons increases with the square root of axial stress.
  • The developed shear wave tensiometer successfully tracked in vivo tendon wave speeds.
  • Tendon wave speeds modulated in phase with active joint torques during dynamic movements.

Conclusions:

  • Non-invasive assessment of muscle-tendon loading is achievable through shear wave tensiometry.
  • This method provides novel insights into motor control and biomechanics of human movement.
  • Potential applications include enhanced clinical treatment for musculoskeletal injuries and diseases.