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Wearable Tendon Kinetics.

Sara E Harper1, Rebecca A Roembke2, John D Zunker2

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Summary
This summary is machine-generated.

A new wearable system uses shear wave tensiometry to measure tendon loading during walking on varied terrain. It reveals how slopes and speed affect Achilles tendon forces, aiding biomechanical research.

Keywords:
Achillesfield-based measurementlocomotionmuscle-tendon mechanicsnoninvasiveshear wave tensiometry

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Area of Science:

  • Biomechanics
  • Wearable Technology
  • Tendon Mechanics

Background:

  • Assessing in-situ tendon loading during natural locomotion is challenging.
  • Existing methods often require controlled laboratory settings.
  • Understanding tendon kinetics during activities like walking is crucial for injury prevention and rehabilitation.

Purpose of the Study:

  • To introduce and validate a noninvasive wearable system for measuring tendon loading during outdoor locomotion.
  • To investigate the effects of terrain slope and walking speed on Achilles tendon loading patterns.
  • To demonstrate the utility of shear wave tensiometry in real-world movement scenarios.

Main Methods:

  • Developed a battery-operated wearable system using piezoelectric actuation to generate shear waves in tendons.
  • Employed miniature accelerometers and a data logger to record wave propagation and calculate wave speed.
  • Integrated inertial measurement units (IMUs) to simultaneously capture participant kinematics and terrain data.
  • Collected data during 1-km outdoor walking trials on variable terrain in young adults.

Main Results:

  • The system successfully recorded Achilles tendon wave speed at 100 Hz during walking.
  • Analysis of 5108 strides showed uphill slopes increased push-off tendon loading, while downhill slopes increased early stance braking loading.
  • Walking speed modulated peak tendon loading on uphill slopes and consistently increased early stance loading across all slopes.

Conclusions:

  • Wearable shear wave tensiometry is a promising noninvasive method for evaluating tendon tissue kinetics in natural environments.
  • The findings highlight the coupled effects of terrain and walking speed on tendon loading patterns.
  • This technology has potential applications in orthopedics, sports science, rehabilitation, and ergonomics.