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Human walking stabilizes gait by simultaneously controlling linear and angular momentum. This study reveals how body momentum influences ground reaction forces, explaining previous observations in bipedal locomotion.

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Area of Science:

  • Biomechanics
  • Human locomotion
  • Robotics

Background:

  • Stabilizing bipedal gait is mechanically complex.
  • Previous research focused on controlling the body's center of mass (CoM).
  • Existing models often linked CoM linear momentum deviations to center of pressure (CoP) shifts, but this overlooks angular momentum dynamics.

Purpose of the Study:

  • To investigate the simultaneous control of linear and angular momentum in human walking.
  • To test the hypothesis that correlations between CoP-CoM distance and ground reaction forces are linked to controlling both linear and angular momentum.
  • To re-evaluate previous findings on gait stabilization in light of dual momentum control.

Main Methods:

  • Analysis of linear and angular momentum during human walking.
  • Combining linear and rotational motion equations for a linked rigid segment system.
  • Fitting regression models to experimental data from participants walking at normal and slow speeds.

Main Results:

  • Linear and angular momentum in human walking exhibit quasi-periodic functions with similar periodicity and phase.
  • The horizontal distance between CoP and CoM is correlated with horizontal force, as predicted by combined motion equations.
  • Ground reaction forces and moments could be predicted from preceding linear and angular momentum deviations.

Conclusions:

  • Human walking simultaneously controls both linear and angular momentum.
  • This dual control mechanism explains observed correlations between CoM states and CoP/foot locations in prior studies.
  • The findings provide a more comprehensive mechanical understanding of gait stabilization.