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Force treadmill for measuring vertical and horizontal ground reaction forces

R Kram1, T M Griffin, J M Donelan

  • 1Department of Integrative Biology, University of California, Berkeley, California 94720-3140, USA. rkram@socrates.berkeley.edu

Journal of Applied Physiology (Bethesda, Md. : 1985)
|August 4, 1998
PubMed
Summary

Researchers developed a novel force treadmill to accurately measure ground-reaction forces and moments during walking and running. This system enhances efficiency for locomotion studies and clinical evaluations.

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Area of Science:

  • Biomechanics
  • Human locomotion analysis
  • Instrument development

Background:

  • Accurate measurement of ground-reaction forces and moments is crucial for understanding human locomotion.
  • Existing methods may be time-consuming or require significant laboratory space.

Purpose of the Study:

  • To develop and validate a force treadmill for measuring multi-component ground-reaction forces and moments during human walking and running.
  • To assess the accuracy and limitations of the developed force treadmill system.

Main Methods:

  • Construction of a lightweight, mechanically stiff treadmill chassis supported by a commercial force platform.
  • Measurement of vertical (Fz), horizontal (Fy), and lateral (Fx) ground-reaction forces, and moments (Mz, My, Mx).
  • Analysis of natural frequencies of vibration and comparison with data from a force platform runway.

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Main Results:

  • The force treadmill accurately measured vertical (Fz), horizontal (Fy) forces, and moments (Mx, My).
  • Natural frequencies for Fz (>178 Hz) and Fy (>87 Hz) were well above the signal content.
  • Signal-to-noise ratios for lateral force (Fx) and vertical moment (Mz) were found to be unacceptable.

Conclusions:

  • The developed force treadmill offers an accurate and efficient method for measuring key gait parameters.
  • The system reduces time and space requirements for locomotion experiments and clinical gait analysis.
  • Further refinement is needed to improve the measurement accuracy of lateral forces and vertical moments.