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Related Experiment Videos

Stiffness adaptations in shod running.

Carolyn Divert1, Heiner Baur, Guillaume Mornieux

  • 1Physiology Laboratory, PPEH Unit, University of Saint-Etiene, France.

Journal of Applied Biomechanics
|February 25, 2006
PubMed
Summary
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Runners adapt their leg and vertical stiffness when running in shoes, but not barefoot. Shoe stiffness also changes initially. Running for at least four minutes before measurement helps stabilize these running mechanics.

Area of Science:

  • Biomechanics
  • Running Mechanics
  • Sports Science

Background:

  • Runners' adaptation to testing conditions is crucial for reliable biomechanical data.
  • Habituated runners may still exhibit pattern changes at the start of a running bout.
  • Understanding stiffness adjustments in shod versus barefoot running is important for performance and injury prevention.

Purpose of the Study:

  • To investigate runners' stiffness adjustments during shod and barefoot running.
  • To examine the stiffness evolution of running shoes over time.
  • To determine optimal measurement timing for running biomechanics.

Main Methods:

  • Twenty-two runners completed 4-minute running bouts at a consistent speed (3.61 m/s) both shod and barefoot.
  • Vertical and leg stiffness were measured during these bouts.

Related Experiment Videos

  • An impactor test assessed shoe stiffness changes over the initial 4 minutes.

    • Main Results:

    • Vertical and leg stiffness decreased significantly during the initial 4 minutes of shod running (p < 0.001).
    • Stiffness remained stable during barefoot running.
    • Shoe stiffness significantly increased during the first 4 minutes of use (p < 0.001), stabilizing thereafter.

    Conclusions:

    • Runners adjust their leg and vertical stiffness during initial shod running, suggesting adaptation to the footwear.
    • Shoe stiffness itself changes during the first few minutes of running.
    • A minimum of 4 minutes of running before data collection is recommended to mitigate alterations in running stiffness due to shoe property modifications and initial runner adaptation.