Introduction: Ankle sprain is one of the most frequent injuries in physically active people and the most common among lower extremity injuries. Although about 50% of these injuries are minor and resolve within a week, between 32% and 74% of subjects develop persistent symptoms such as pain, swelling, a feeling of sagging and reduced function, and recurrent sprains within 12 months of the first event. This set of symptoms is referred to as chronic ankle instability. Materials and Methods: This study included 30 subjects aged between 20 and 35 years. The subjects were initially divided into two groups: the experimental group followed a 4-week protocol with VISS, while the control group completed a 4-week protocol of proprioceptive and balance exercises. Results: The research protocol demonstrated that the 6-week VISS protocol is effective in improving the pathological condition of Chronic Ankle Instability (CAI), resulting in enhanced muscle tone, reduced pain, and a decreased perception of instability. Conclusions: Although limited by the sample size, the results of this study provide a starting point for future research.
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