Effects Of Personalized Strength Training On Isokinetic Muscle Strength And Balance In Fencers With CAI

Chronic ankle instability (CAI) is a prevalent issue among athletes, especially those participating in sports that involve rapid lateral movements, such as fencing. Strength training is recognized as an essential intervention for improving the stability and functional performance of athletes with CAI. However, there is limited research focusing specifically on fencing athletes with CAI. Given the particular demands of fencing, it is hypothesized that an individualized strength training program tailored to the biomechanics of the sport could provide more effective results in improving ankle stability. PURPOSE: To evaluate the effects of personalized strength training on isokinetic muscle strength and balance in fencers with CAI. METHODS: Twenty-one fencers with CAI were randomly assigned to three groups: a control group (CG, n = 7), a standardized strength training group (SG, n = 7), and a personalized strength training group (PG, n = 7). The intervention lasted for six weeks, with training performed three times per week. Isokinetic muscle strength was assessed at 30°/s and 120°/s for concentric and eccentric ankle eversion. Balance was measured using single-leg stance tests (eyes open and closed) and the Y-balance test. Functional performance was evaluated using the Cumberland Ankle Instability Tool (CAIT). RESULTS: Significant improvements were found in the PG for eccentric eversion peak torque at both 30°/s (p < 0.001) and 120°/s (p = 0.004). The dynamic control ratio (DCR) also improved significantly in the PG at 30°/s (p = 0.001) and 120°/s (p = 0.012). In terms of balance, the PG demonstrated significant improvements in single-leg stance with eyes closed (p = 0.000) and a trend toward improvement in dynamic balance as assessed by the Y-balance test. Additionally, the PG showed a highly significant increase in CAIT scores (p < 0.001), indicating improved functional stability. No significant improvements were observed in the CG or SG. CONCLUSION: Personalized strength training was more effective than standardized programs in improving isokinetic muscle strength, balance, and functional stability in fencers with CAI. The results suggest that individualized rehabilitation protocols tailored to the specific demands of the sport are essential for optimal recovery and injury prevention in athletes with CAI. Supported by: Project Title: Special Program for Key Project Scientific Research and Technological Services in Beijing ；Sub-project Title: Study on the Effectiveness of Targeted Strength Training in Improving Chronic Ankle Instability in Fencing ；Project Number: 2023BTP003