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Long-Term High-Heel (HH) Use - PowerPoint PPT Presentation


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Long-Term High-Heel (HH) Use. Shortens gastrocnemius muscle fascicles Increases Achilles Tendon Stiffness What are the functional consequences of these changes during HH and barefoot walking? Muscle activity Muscle strain. Methods: Subjects. 2 groups HH group:

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long term high heel hh use
Long-Term High-Heel (HH) Use
  • Shortens gastrocnemius muscle fascicles
  • Increases Achilles Tendon Stiffness
  • What are the functional consequences of these changes during HH and barefoot walking?
    • Muscle activity
    • Muscle strain
methods subjects
Methods: Subjects
  • 2 groups
    • HH group:
      • 9 young women who have worn heels for at least 40 hr/wk for last two years (2 inch heels)
    • Control group:
      • 10 women who habitually wore heels for less than 10 hr/week.
methods protocol
Methods: Protocol
  • Walk over a level 8m walkway 10 times:
    • Barefoot/HH
  • Data Collection
    • EMG:
      • Soleus, Gastrocnemius, Tibialis Anterior Muscles
    • Ultrasound
      • gastrocnemius
results muscle activity
Results: Muscle Activity

Percent Contact Time

  • Greater muscle activity in habitual high-heel walkers
  • Even when barefoot!
results muscle fascicle strain
Results: Muscle Fascicle Strain

Percent Contact Time

Percent Contact Time

  • Shorter fascicle lengths in habitual high-heel walkers
  • Greater fascicle strains in habitual high-heel walkers
  • Even when barefoot!
putting it all together
Putting it all together
  • In habitual high-heel walkers:
    • Stiffer tendon
    • Shorter fascicle lengths
    • Greater muscle activity
    • Greater fascicle strains
    • Even when barefoot!

Length change is being redistributed from the tendon to the muscle!  BAD

Muscle-Tendon units operate the best when the length change is taken up by the tendon, with minimal length change in the muscle.