CONTEXT: Deficits in the propioceptive system of the ankle contribute to chronic ankle instability (CAI). Recently, wholebody--vibration (WBV) training has been introduced as a preventive and rehabilitative tool. OBJECTIVE: To evaluate how a 6-week WBV training program on an unstable surface affected balance and body composition in recreational athletes with CAI. DESIGN: Randomized controlled clinical trial. SETTING: Research laboratory. PATIENTS OR OTHER PARTICIPANTS: Fifty recreational athletes with self-reported CAI were randomly assigned to a vibration (VIB), nonvibration (NVIB), or control group. INTERVENTION(S): The VIB and NVIB groups performed unilateral balance training on a BOSU 3 times weekly for 6 weeks. The VIB group trained on a vibration platform, and the NVIB group trained on the floor. MAIN OUTCOME MEASURE(S): We assessed balance using the Biodex Balance System and the Star Excursion Balance Test (SEBT). Body composition was measured by dual-energy x-ray absorptiometry. RESULTS: After 6 weeks of training, improvements on the Biodex Balance System occurred only on the Overall Stability Index (p = 0.01) and Anterior-Posterior Stability Index (p = 0.03) in the VIB group. We observed better performance in the medial (p = 0.008) and posterolateral (p = 0.04) directions and composite score of the SEBT in the VIB group (p = 0.01) and in the medial (p < 0.001), posteromedial (p = 0.002), and posterolateral (p = 0.03) directions and composite score of the SEBT in the NVIB group (p < 0.001). No changes in body composition were found for any of the groups. CONCLUSIONS: Only the VIB group showed improvements on the Biodex Balance System, whereas the VIB and NVIB groups displayed better performance on the SEBT.

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