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Why we walk the way we do.

Y Brenière1

  • 1Laboratoire de Physiologie du Mouvement, Université Paris-Sud, Orsay, France. yvon.breniere@lpm.upsud.fr

Journal of Motor Behavior
|December 1, 1996
PubMed
Summary

This study reveals a natural body frequency (NBF) as a biomechanical constant influencing human gait and posture. This invariant parameter relates body parameters and gravity to locomotion control.

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Area of Science:

  • Biomechanics
  • Human Locomotion
  • Physics of Movement

Background:

  • Human gait and posture involve complex interactions between body parameters and gravity.
  • Understanding the fundamental principles governing these movements is crucial for biomechanical analysis.

Purpose of the Study:

  • To establish the principle of oscillating systems in human gait.
  • To determine the influence of gravity and body parameters on gait parameters like step frequency and length.
  • To identify and define a biomechanical constant related to human posture and locomotion.

Main Methods:

  • Utilized inverse dynamics and forceplate recordings to analyze gait.
  • Calculated the ratio of center of mass (CM) and center of foot pressure (CP) oscillation amplitudes.
  • Developed and tested an equation for natural body frequency (NBF) using experimental data, including stepping in place.

Main Results:

  • Established the natural body frequency (NBF) as an absolute invariant parameter specific to human standing posture and gait in terrestrial gravity.
  • Demonstrated that NBF influences the relative positions of CM and CP.
  • Showed that NBF separates frequency bands for standing posture from those for gait.
  • Quantified the relationships between body parameters, gravity, and the central programming of locomotor parameters.

Conclusions:

  • The natural body frequency (NBF) is a fundamental biomechanical constant governing human locomotion.
  • NBF provides insights into the control mechanisms of gait and posture.
  • This research offers a new framework for understanding the interplay of body dynamics, gravity, and movement control.

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