Effects of Selected Four Weeks Training on Hip and Knee Kinematics Local Dynamic Stability during Vertical Jump in Active Young Men

Quantifying dynamic stability of athletic skills help to identification of motor behavior complexity to reduce injury and improve performance. The purpose of this study was to evaluate the effects of training on local dynamic stability in vertical jump maneuver. Twenty young male subjects (control (n=10), exercise (n=10)) participated in this study. Hip and knee kinematics and ground reaction forces data during vertical jump were recorded at pre-test and post-test. Exercise group participated in the vertical jump training program for four weeks (Twelve 40-minute sessions). Using largest finite- time Lyapunov exponent; a nonlinear method; local dynamic stability of hip and knee angular positions was calculated. The results showed that following increase in vertical jump height, selected protocol training significantly improved the dynamical stability of the knee joint. It seems, increasing vertical jump height following training, leading to greater stability of the knee joint rather than the hip.