The purposes of this study were to a) strengthen the gluteal and hamstring muscles of 14 elite female volleyball players via a six week isometric strength training program to b) determine changes in peak knee valgus angle, c) determine any changes in tibial acceleration, and d) determine changes in vertical ground reaction forces at peak valgus angle during a drop-jump landing task. Significant strength increases were seen in hip extension (20.5%), abduction (27.5%), and knee flexion (23.5%) in the training group. No significant group changes were observed for knee valgus angle, tibial acceleration, or ground reaction forces. Notable significant individual changes were found for knee valgus angle, knee flexion angle, peak vertical ground reaction forces, and tibial accelerations. A trend of decreased knee flexion in the training group was also observed. Isometric strength training increases strength, and could potentially decrease knee valgus in certain individuals.
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