Effects of Ankle Evertor Fatigue on Perturbed Gait
Effects of Ankle Evertor Fatigue on Gait Perturbation Responses in Individuals With and Without Chronic Ankle Instability
University of Ljubljana
40 participants
May 5, 2025
OBSERVATIONAL
Conditions
Summary
This study will investigate the effects of ankle evertor muscle fatigue on gait stability during treadmill walking with mechanical perturbations. Participants will walk at two speeds (0.4 m/s and 1.0 m/s) while random medial and lateral perturbations (\<10% body weight) are applied to the pelvis. Surface EMG from ankle muscles and center of pressure (COP)-based gait parameters (e.g., step length, step width, single support duration, COP trajectory) will be analyzed before and immediately after an isotonic fatigue protocol of the ankle evertors.
Eligibility
Inclusion Criteria10
- Age between 18 and 45 years,
- No history of injuries or surgical procedures to the lower limbs,
- No peripheral or central neurological impairments.
- Age between 18 and 45 years,
- No history of major surgical procedures on the lower limbs
- No peripheral or central neurological impairments,
- Diagnosed chronic ankle instability:
- First ankle sprain occurred at least one year prior to testing,
- At least three months since the most recent ankle sprain,
- Subjective feeling of ankle instability - CAIT (Cumberland Ankle Instability Tool) score \< 24.
Exclusion Criteria2
- Other pathologies of the ankle joint.
- Acute pain
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Interventions
The fatigue protocol will consist of repeated concentric-eccentric ankle eversion contractions against elastic resistance at a pace of one repetition per second, guided by a metronome, and performed in a seated position. Fatigue will be defined as a clear inability to perform the full range of eversion, i.e. the range of motion falling below 50% of the initial value despite evident effort by the participant.
Locations(1)
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NCT07273097