Introduction: This study aimed to compare the effectiveness of corrective-plyometric training with and without visual feedback on landing biomechanics and dynamic balance in adolescent female athletes with dynamic knee valgus (DKV). Materials and Methods: A total of 26 adolescent female athletes were randomly divided into feedback (n=10), exercise (n=8), and control (n=8) groups. Six weeks of training with and without visual feedback were prescribed for feedback and exercise groups, respectively. Biomechanical data were measured at initial contact (IC) and maximum knee flexion (MAX) using 8 motion analysis cameras (Vicon) and a Kistler force plate. Y-balance test was employed to evaluate dynamic balance. Results: Based on the between-group outcomes, knee flexion-extension moment at IC (P=0.026), hip internal rotation angle at IC (P=0.016), and MAX (P=0.028) significantly changed during double-leg landing. Ankle dorsiflexion angle (P=0.05), tibial external rotation angle (P=0.012), and anterior-posterior ground reaction force (P=0.05) at IC, maximum tibial external rotation angle between IC to MAX (P=0.042), and hip internal rotation angle at MAX (P=0.022) significantly changed during single-leg landing test. Y-balance significant improvements were recorded in anterior (P=0.000), posteromedial directions (P=0.000), and composite (P=0.023). Conclusion: Corrective-plyometric exercises without visual feedback effectively improve landing biomechanics and dynamic balance in adolescent female athletes with DKV.

Introduction: Post-activation potentiation has an influence on short duration and high intensity function. This study aimed to answer this question whether post-activation potentiation protocol in different models has effect on anaerobic performance in women Wushu athletes. Methods: Women elite Taolu Wushu athletes participated in current crossover design study. (i) specific Wushu WU (Wushu WU); (ii) Strength-based WU (StreWU); and (iii) Speed-based WU (SpeWU) were performed by Wushu athletes in three inconsecutive days separated by 48 h. Five minutes after each WU protocols, Running-Based Anaerobic Sprint Test (RAST) was performed. Heart rate, immediately, and blood lactate were measured for 4 times: before WU protocols, immediately after WU protocols, before RAST, immediately after RAST.Results: Data analysis revealed significant differences in 4 time points of lactate levels (p=0.001; d=1.71), although no significant difference among protocols was observed. Values of variables obtained from RAST showed that StreWU had a significant impact on minimum power (p<0.05; d=-0.795) comparing to WushuWU and on fatigue index comparing to SpeWU (p<0.05; d=-0.799). No significant differences were found among the WU protocols for peak power and mean power.Conclusion: All WU protocols had mostly the same effect, and PAP was not very effective. Possibly, the WU protocols generated too much fatigue, due to the short-term rest time. However, longer intervals would likely enter the realm of post-activation performance enhancement, which is distinct from PAP.

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