Document Type



This work was to investigate the effect of stiffness of the knee and ankle alignment on impact loads in lower extremity during gymnastic floor exercise. A movement of a floor exercise landing was captured􀋈with its kinematic data were obtained using digitization software. A multi-body model with 14 segments of the gymnast and a model of the mat were separately developed. Computer simulation of landing with different stiffness of the knee and ankle alignment was performed. The peak vertical and horizontal GRFs were 11.8 BW and 2.5 BW during the actual landing. Peak knee extensor moment was increased by 11.6%, but peak knee flexor was decreased by 5.2%, when the stiffness increased by 40%. This work suggests that increase in stiffness of knee and ankle alignment would increase the peak moment of knee extensor and decrease the peak moment of knee abduction.