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Strategy quantification using body worn inertial sensors in a reactive agility task.

Chika U Eke1, Stephen M Cain2, Leia A Stirling3

  • 1Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Journal of Biomechanics
|October 28, 2017
PubMed
Summary

New biomechanical metrics using body-worn sensors reveal key factors for faster agility performance. This research can inform training and rehabilitation strategies for athletes, clinicians, and military personnel.

Keywords:
Direction changeHuman performanceOutdoorsSpeedStride parameters

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Area of Science:

  • Biomechanics
  • Sports Science
  • Human Movement Analysis

Background:

  • Traditional time-based agility metrics offer limited insight into performance determinants.
  • Understanding the biomechanical underpinnings of agility is crucial for targeted training and rehabilitation.

Purpose of the Study:

  • To identify specific biomechanical metrics sensitive to agility performance speed.
  • To correlate these metrics with expert-defined agility concepts.
  • To lay the groundwork for a composite agility score.

Main Methods:

  • Eighteen participants performed a reactive agility task while wearing 13 body-worn inertial sensors.
  • Data from sensors were used to calculate five defined biomechanical metrics.
  • Participants were categorized into fast, medium, and slow performance groups based on completion time.

Main Results:

  • Faster agility was associated with a lower normalized number of foot contacts, higher normalized stride length variance, higher forearm angular velocity variance, and higher normalized stride frequency.
  • The number of body rotations did not show sensitivity to performance speed.

Conclusions:

  • Specific biomechanical metrics derived from inertial sensors can quantify agility performance.
  • These findings support the development of a composite agility score for enhanced training and rehabilitation strategies.
  • This approach has potential applications in athletic, clinical, and military settings.