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Related Experiment Videos

Prolonged peroneal reaction time in ankle instability.

L Konradsen1, J B Ravn

  • 1Department of Orthopedics, County Hospital, Hillerød, Denmark.

International Journal of Sports Medicine
|June 1, 1991
PubMed
Summary

Athletes with unstable ankles exhibit slower peroneal reflex times and poorer postural control, suggesting a proprioceptive reflex deficit contributes to ankle instability. Ankle taping did not significantly enhance reflexes in this study.

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Area of Science:

  • Biomechanics
  • Sports Medicine
  • Neurology

Background:

  • Functional ankle instability (FAI) is common in athletes.
  • FAI is theorized to involve proprioceptive reflex deficits.
  • Understanding the mechanisms of FAI is crucial for injury prevention and rehabilitation.

Purpose of the Study:

  • To compare peroneal reflex time and postural control in athletes with and without functional ankle instability.
  • To investigate the relationship between peroneal reaction time, postural sway, and functional ankle instability.
  • To assess the effect of ankle taping on reflex responses in unstable ankles.

Main Methods:

  • 15 athletes with FAI and 15 stable controls were studied.
  • Sudden ankle inversion was induced using a trapdoor mechanism.

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  • Electromyography recorded peroneal muscle activity; postural sway was measured on a force plate during single-limb stance.

    • Main Results:

    • Subjects with FAI demonstrated significantly increased postural sway (p < 0.01).
    • Functionally unstable athletes showed significantly longer peroneal reflex reaction times (p < 0.01).
    • A strong positive correlation was found between postural sway and peroneal reaction time (Spearman's rho = .92).

    Conclusions:

    • Proprioceptive reflex impairment likely contributes to functional ankle instability.
    • Poorer postural control is associated with delayed peroneal reflex responses in athletes.
    • Ankle taping did not demonstrate a significant reflex-enhancing effect via cutaneous stimulation in this cohort.