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Related Experiment Videos

Leg stiffness and foot orientations during running

F Viale1, G Dalleau, P Freychat

  • 1Laboratoire de Physiologie de l' Exercice, Faculté de Médecine Lyon-Sud, Oullins, France.

Foot & Ankle International
|December 5, 1998
PubMed
Summary

Running leg stiffness (Kleg) is linked to foot posture. A more open foot posture during running correlates with lower leg stiffness, suggesting foot structure influences running mechanics.

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Area of Science:

  • Biomechanics
  • Sports Science
  • Human Movement Analysis

Background:

  • Leg stiffness (Kleg) is a crucial factor in running economy and injury prevention.
  • Understanding the factors influencing Kleg, such as foot structure, can inform training and injury mitigation strategies.

Purpose of the Study:

  • To investigate the relationship between leg stiffness (Kleg) during running and foot posture in standing (RFAst) and running (RFArun).
  • To determine if foot structure, specifically the rearfoot-to-forefoot angle, influences leg stiffness in runners.

Main Methods:

  • Utilized footprint analysis to calculate RFAst and RFArun in 32 subjects.
  • Employed a spring-mass model and force platform data to compute Kleg during running.
  • Categorized runners into 'opened foot' (RFArun > 0) and 'closed foot' (RFArun < 0) groups.

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Main Results:

  • A significant negative correlation was found between Kleg and both RFAst and RFArun.
  • Runners with an 'opened foot' posture exhibited lower Kleg compared to those with a 'closed foot' posture.
  • Average Kleg was 13.0 +/- 2.7 kN x m(-1), RFAst was -8.4 +/- 6.4 degrees, and RFArun was -0.4 +/- 7.2 degrees.

Conclusions:

  • Foot structure, indicated by the rearfoot-to-forefoot angle, appears to be a significant determinant of leg stiffness in runners.
  • These findings suggest that variations in foot posture contribute to the observed differences in leg stiffness among individuals.
  • Implications for understanding running biomechanics and potential interventions for optimizing performance and reducing injury risk.