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Does Foot Anthropometry Predict Metabolic Cost During Running?

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Summary
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Shorter heel length in runners correlates with higher Achilles tendon forces, but does not reduce metabolic energy cost. This challenges the hypothesis that shorter heels improve running economy through increased tendon energy storage.

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Area of Science:

  • Biomechanics
  • Human Physiology
  • Sports Science

Background:

  • Previous research suggests a link between running economy and heel length, with shorter heels potentially reducing metabolic cost.
  • A hypothesis proposes that shorter heels increase plantar flexor muscle forces, enhancing tendon energy storage and lowering metabolic expenditure.

Purpose of the Study:

  • To investigate the mechanism by which shorter heel length might reduce metabolic cost during running.
  • To examine the relationship between heel length, Achilles tendon forces, and oxygen consumption in male runners.

Main Methods:

  • Fifteen male subjects ran at 16 km/h on a treadmill and a force-plate instrumented runway.
  • Collected data included oxygen consumption, kinematics, and ground reaction forces.
  • Correlational analyses assessed relationships between oxygen consumption, anthropometric/kinetic variables, and heel length.

Main Results:

  • A strong correlation was found between normalized peak Achilles tendon force and normalized heel length (r = -0.751, p = 0.003).
  • Subjects with shorter heels exhibited greater Achilles tendon forces.
  • No significant correlation was observed between heel length and oxygen consumption, nor did other measured variables explain metabolic cost variance.

Conclusions:

  • While shorter heel length is associated with increased Achilles tendon forces, this does not translate to reduced metabolic cost in running.
  • The hypothesized mechanism of improved running economy via enhanced tendon energy storage with shorter heels was not supported by this study.
  • Neither heel length nor other examined biomechanical factors adequately explain individual differences in running metabolic cost.