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Stability in skipping gaits.

Emanuel Andrada1, Roy Müller2, Reinhard Blickhan2

  • 1Science of Motion, Friedrich Schiller University Jena, Jena, Thüringen, Germany; Institut für Spezielle Zoologie und Evolutionsbiologie mit Phyletischem Museum, Friedrich Schiller University Jena, Jena, Thüringen, Germany.

Royal Society Open Science
|December 27, 2016
PubMed
Summary
This summary is machine-generated.

Adults avoid skipping due to high energy costs, but this study suggests stability and robustness may be key factors. Research explored skipping dynamics using human data and simulations, revealing insights into locomotion strategies.

Keywords:
biomechanicslocomotionskippingslipstability

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Area of Science:

  • Biomechanics
  • Locomotion dynamics
  • Human movement analysis

Background:

  • Skipping is an alternative human gait to walking and running, yet it is largely avoided by adults.
  • This avoidance is often attributed to higher energetic costs, despite its use by children and various animal species.
  • The underlying biomechanical factors influencing the choice and stability of skipping gaits remain incompletely understood.

Purpose of the Study:

  • To investigate the role of stability and robustness in motivating the use of skipping gaits.
  • To model and analyze the dynamics of human skipping using experimental data and numerical simulations.
  • To compare the energetic costs and stability characteristics of different skipping strategies.

Main Methods:

  • Collected experimental data from 10 male subjects performing unilateral skipping along a runway.
  • Utilized a bipedal spring-loaded inverted pendulum model to simulate and describe skipping dynamics.
  • Analyzed peak ground reaction forces and leg stiffness parameters for both leading and trailing legs.

Main Results:

  • Skipping was found to be stable across a wide range of speeds, from stationary to fast running.
  • Higher leg stiffness in the trailing leg was associated with longer strides at equivalent system energy.
  • Simulations indicated that while trailing leg stiffness aids stride length, leading leg stiffness enhances robustness to perturbations, though potentially at a higher energetic cost.

Conclusions:

  • Stability across diverse speeds is a significant characteristic of skipping gaits.
  • Leg stiffness strategies in skipping influence the trade-off between energetic cost, stride length, and robustness.
  • The findings provide biomechanical insights into why skipping, despite its potential advantages, is not a preferred locomotion method for adults.