Biomechanical characteristics in sports have an important impact on teaching effect. This paper analyzes the changes of biomechanical parameters of athletes under different fatigue states through high-performance computing simulation to provide scientific basis for improving physical education and preventing sports injuries. In this study, a human musculoskeletal model was established by Anybody biomechanical simulation software, and 30 male athletes were selected as subjects, divided into 15 in the experimental group (FAI group) and 15 in the control group, and the biomechanical characteristics of lower limb joints were tested in different fatigue states (no fatigue, moderate fatigue and severe fatigue). The results of the study showed that the knee and hip flexion angles decreased significantly in the fatigue state, and the knee flexion angle at the initial touchdown moment decreased from 20.75±9.72° in the no-fatigue state to 16.94±10.24° in the severe fatigue state, and the peak knee extension moment decreased from 2.76±0.15N-m/kg in the no-fatigue state to 2.12±0.15N-m/kg in the moderate fatigue state, the vertical stiffness decreased from 58.73±14.34KN/m in the no-fatigue state to 46.47±10.45KN/m in the severe fatigue state, and there was no significant difference in the ground reaction force parameters before and after fatigue. The conclusion of the study shows that the biomechanical characteristics of the lower limbs in the state of sports fatigue change significantly, and this change may be a reflection of the human body’s own protective mechanism, and by reasonably adjusting the training intensity and fatigue management can optimize the effect of physical education and reduce the risk of sports injuries.
