The goal of this clinical trial is to compare the applicability and effectiveness of capacitive and resistive Electric transfer (CRET) therapy in combination with balance training in improving ankle function, proprioception, and balance in patients with chronic ankle instability (CAI). The main questions it aims to answer are: * Can CRET therapy expedite the rehabilitation process for patients with chronic ankle instability? * Does the combination of CRET therapy and balance training yield superior efficacy to other interventions? This study involved 31 physically active participants with unilateral ankle instability, comprising 19 males and 12 females. The participants were randomly assigned to one of three groups: the balance training group (B Group), the capacitive and resistive electric transfer group (CRET Group), and the balance training combined with the capacitive and resistive electric transfer group (B+CRET Group).
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Ankle Joint Functional Assessment Tool
Timeframe: Each subject was tested before the first intervention training and after the twelfth intervention training (4 weeks after the first intervention).
One Leg Standing Test
Timeframe: Each subject was tested before the first intervention training and after the twelfth intervention training (4 weeks after the first intervention).
The modified Star Excursion Balance Test
Timeframe: Each subject was tested before the first intervention training and after the twelfth intervention training (4 weeks after the first intervention). The time, place, and testers of the test were kept consistent.