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Related Concept Videos

Muscles of the Leg that Move the Foot and Toes01:28

Muscles of the Leg that Move the Foot and Toes

The human leg comprises an intricate system of muscles that facilitate the movement of feet and toes. Within this system, the muscles are categorized into the anterior, lateral, and posterior compartments, each with a unique set of muscles carrying out specific functions.
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The time response of a linear time-invariant (LTI) system can be divided into transient and steady-state responses. The transient response represents the system's initial reaction to a change in input and diminishes to zero over time. In contrast, the steady-state response is the behavior that persists after the transient effects have faded.
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Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability
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Published on: September 18, 2020

Does a crouched leg posture enhance running stability and robustness?

Yvonne Blum1, Aleksandra Birn-Jeffery, Monica A Daley

  • 1Lauflabor Locomotion Laboratory, University of Jena, Jena, Germany. Yvonne.Blum@uni-jena.de

Journal of Theoretical Biology
|May 17, 2011
PubMed
Summary

Humans and birds exhibit distinct running strategies due to leg differences. While crouched postures may not inherently improve stability, they can enhance robustness in avian running, unlike human straight-leg running which requires stiffness adjustments.

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Area of Science:

  • Biomechanics
  • Comparative Physiology
  • Locomotion Analysis

Background:

  • Humans and birds share bipedal locomotion but differ in leg architecture.
  • Gait patterns suggest species-specific control strategies for stable running.
  • Understanding these differences is key to analyzing running mechanics.

Purpose of the Study:

  • To derive and compare control strategies for stable running in humans and birds using a conceptual model.
  • To investigate the role of leg posture (straight vs. crouched) in running stability and robustness.
  • To analyze kinematic control parameters and leg stiffness adaptations in human and avian running.

Main Methods:

  • Utilized a planar spring mass model to represent compliant leg running.
  • Applied swing leg control with linear adaptations of leg angle, length, and stiffness.
  • Compared model predictions with experimental kinematic data from running humans and pheasants.

Main Results:

  • Identified differences in stability and control strategies between human and avian running.
  • Model suggests crouched leg posture does not necessarily enhance stability but may improve robustness.
  • Avian running with crouched legs allows stability without leg stiffness adjustment; human running requires it.

Conclusions:

  • Species-specific leg architecture influences running control strategies.
  • Crouched avian leg posture offers robustness to terrain variations, unlike human straight-leg posture.
  • Running stability depends on a complex interplay of leg parameters and control strategies.