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Foot-Placed Inertial Measurement Units Are Valid Against Shank-Placed Units When Measuring Temporospatial Running

Madison S Mach1,2, Hayley Ericksen3, Erin Lally4

  • 1School of Rehabilitation Sciences and Technology, University of Wisconsin-Milwaukee, Milwaukee, WI, USA.

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|March 20, 2025
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Foot-placed RunScribe inertial measurement units (IMUs) accurately measure running step rate (SR) and stride length (SL), offering a valid alternative to shank-mounted IMUs for gait analysis and injury prevention.

Keywords:
running gaitstep ratestride lengthvalidity

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Area of Science:

  • Biomechanics
  • Sports Science
  • Wearable Technology

Background:

  • Running is a popular exercise but carries a risk of lower-extremity injuries.
  • Inertial measurement units (IMUs) analyze running gait, identifying injury risk factors like low step rate (SR) and long stride length (SL).
  • Validation is needed for foot-placed IMUs (RunScribe) against shank-placed IMUs.

Purpose of the Study:

  • To determine the criterion validity of RunScribe foot-placed IMUs compared to a MyoMotion shank-placed IMU for measuring SR and SL.

Main Methods:

  • A cross-sectional laboratory study involved nine participants running on a treadmill.
  • Data from RunScribe foot-based IMUs and MyoMotion shank-based IMUs were collected simultaneously.
  • Validity was assessed using Pearson correlations, intraclass correlation coefficients, and Bland-Altman plots.

Main Results:

  • Strong correlations were found for both SR (r = .90) and SL (r = .80) between foot- and shank-placed IMUs.
  • Excellent reliability was observed for SR (ICC = .91) and good reliability for SL (ICC = .80).
  • Bland-Altman analysis indicated good agreement between the two sensor placements for both metrics.

Conclusions:

  • Foot-placed RunScribe IMUs demonstrate criterion validity for measuring running SR and SL.
  • RunScribe IMUs provide a valid and potentially more accessible alternative to shank-placed IMUs for gait analysis.