| Objective:The purpose of this study was to investigate the lower extremity kinetics and kinematics changes during stop-jump tasks between pre-fatigue and post-fatigue.To determine whether fatigue is a risk factor in lower extremity injuries.Methods:Subjects were 10 male basketball athletes from Beijing Sports University.Three-dimensional videography (Motion Analysis Raptor-4,200Hz) and force plate data (Kistler 9281CA,1000Hz) were collected for athletes performing 3 stop-jump tasks before and after completing a run-jump fatigue protocol.Results:During jump stage, knee flexion angle was less than prefatigue in contact phase, ankle stretching time was greater than prefatigue, ankle stretching velocity was less than prefatigue, vertical stretching impulse was less than prefatigue (p<0.05). During pre-contact phase, hip flexion angle,ankle planter flexion angle,ankle inversion angle,ankle pronation angle were all rised than prefatigue, Besides, knee adduction angle were less than prefatigue (p<0.05).Landing phase, second peak vertical ground reaction force, average loading rate and peak average loading rate were greater than prefatigue (p<0.05). Besides, knee adduction angle were less than prefatigue in pre-contact phase. Ankle planter flexion angle and pronation angle were rised than prefatigue in contact phase (p<0.05). Peak ankle planter flexion angle,peak ankle planter flexion angular velocity,peak ankle pronation angular velocity,the ROM of ankle planter flexion angle and the ROM of ankle pronation angle were less than prefatigue in post-contact phase (p<0.05).Peak hip adduction torque, peak knee extend and adduction torque, peak ankle external rotation torque were less than prefatigue (p<0.05)Conclusions:Fatigue altered locomotor performance by changing the lower extremity kinetics and kinematics features. Fatigue might not increase risk of anterior cruciate ligament injury. Fatigue altered ankle kinetics and kinematics features which increased risk of ankle injuries. |
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