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Related Experiment Video

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Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability
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Lower-extremity electromyography measures during walking with ankle-destabilization devices.

Luke Donovan1, Joseph M Hart, Jay Hertel

  • 1Kinesiology Program, University of Virginia, Charlottesville, VA.

Journal of Sport Rehabilitation
|January 24, 2014
PubMed
Summary

Ankle-destabilization devices significantly altered lower-extremity muscle activation during walking in healthy adults. These findings suggest potential benefits for neuromuscular control in rehabilitation programs.

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Area of Science:

  • Biomechanics
  • Rehabilitation Science
  • Sports Medicine

Background:

  • Ankle-destabilization devices are used in rehabilitation to enhance neuromuscular control.
  • These devices aim to improve muscle activation in the lower extremities.
  • Testing these devices in healthy individuals is crucial before clinical application.

Purpose of the Study:

  • To compare the electromyography (EMG) activation of lower-extremity muscles during walking.
  • To evaluate the effects of two different ankle-destabilization devices (boot and sandal) on muscle activation.

Main Methods:

  • A crossover design was employed in a laboratory setting.
  • Fifteen healthy young adults participated in the study.
  • Surface EMG was recorded from six lower-extremity muscles while participants walked under three conditions: shod, with an ankle-destabilization boot (ADB), and with an ankle-destabilization sandal (ADS).

Main Results:

  • Both ADB and ADS significantly increased pre- and post-contact muscle activation for specific muscles (peroneus longus, lateral gastrocnemius).
  • The ADB condition also showed increased post-contact activation in the rectus femoris and biceps femoris compared to shod walking.
  • Muscle activation onset was earlier and duration was longer across the stride cycle for several muscles under both ADB and ADS conditions.

Conclusions:

  • Both ankle-destabilization devices demonstrably altered muscle activity patterns during walking.
  • These alterations suggest a potential positive impact on neuromuscular control for individuals with injuries.
  • The findings support the consideration of these devices in rehabilitation programs to improve patient outcomes.