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Effects of Visual Feedback Closed Kinetic Chain Exercise on the Lower Limb Muscles Activity and ankle Instability in Adult men with Chronic Ankle Instability
J Korean Soc Phys Med 2019;14(1):131-138
Published online February 28, 2019;
© 2019 Korean Society of Physical Medicine.

Seung-Min Nam, PT, Ph.D⋅Do-Youn Lee, PT, Ph.D

Department of Physical Therapy, Daegu University
Received November 23, 2018; Revised November 27, 2018; Accepted December 28, 2018.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
PURPOSE: This study examined the effects on muscle activation and ankle instability following sudden ankle inversion of the closed kinetic chain exercise using visual feedback to evaluate chronic ankle instability in adult males.
METHODS: In this study, 28 subjects with chronic ankle instability were recruited and randomly divided into a closed kinetic chain exercise using a visual feedback group(n=13) and an open kinetic chain exercise group(n=15). Each group underwent 30 minutes of exercise three times a week for 8 weeks. The electromyographic(EMG) values of the rectus femoris, biceps femoris, tibialis anterior, peroneus longus, peroneus brevis, and lateral gastrocnemius muscles were measured to analyze muscle activity. The Cumberland ankle instability tool(CAIT) was used to measure ankle instability.
RESULTS: Both groups showed improvements in tibialis anterior, peroneus longus and CAIT score(p<.05). In the experimental group, there were significant improvements in the rectus femoris, biceps femoris, and lateral gastrocnemius muscle activation(p<.05).
CONCLUSION: The results suggest that closed kinetic chain exercise using visual feedback can be a useful treatment method for patients with chronic ankle instability.
Keywords : Chronic ankle instability, Closed kinetic chain exercise, Muscle activation, Visual feedback

February 2019, 14 (1)
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