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Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability
Published on: September 18, 2020
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Submaximal Force Steadiness and Accuracy in Patients With Chronic Ankle Instability
Hyunwook Lee1, S Jun Son2, Hyunsoo Kim3
1Department of Exercise Sciences, Brigham Young University, Provo, UT.
Journal of Athletic Training
|November 5, 2020
Summary
Patients with chronic ankle instability (CAI) show impaired sensorimotor control, affecting force steadiness and accuracy. This suggests CAI predisposes individuals to further injury due to difficulties in movement correction.
Area of Science:
- Biomechanics
- Motor Control
- Sports Medicine
Background:
- Chronic ankle instability (CAI) is associated with sensorimotor impairments.
- Submaximal force steadiness and accuracy assess sensory, motor, and visual feedback mechanisms.
- Understanding these deficits is crucial for CAI management.
Purpose of the Study:
- To compare hip and ankle submaximal force steadiness and accuracy in individuals with CAI versus healthy controls.
- To investigate sensorimotor control deficits in CAI.
Main Methods:
- Case-control study design.
- Involved 21 individuals with CAI and 21 healthy controls.
- Assessed maximal voluntary isometric contraction (MVIC) and force steadiness/accuracy at 10% and 30% of MVIC for ankle and hip muscles.
Main Results:
- CAI group exhibited significantly less accuracy in ankle inversion (P < .001).
- The CAI group demonstrated reduced steadiness and accuracy at 10% MVIC across all tested movements (P < .001).
- CAI participants showed lower hip abduction force output during MVIC (P < .0001).
Conclusions:
- Individuals with CAI struggle with fine force control (10% and 30% MVIC) via feedback mechanisms.
- Sensorimotor deficits in CAI may increase susceptibility to injury by impairing movement adjustments based on sensory and visual information.
