The Effect of Running Fatigue on Lower Limb Biomechahics:A Case Study of Female Novice Runners
Objective:This study aimed to compare the biomechanical differences in the lower limbs of novice female runners in the pre and post-fatigue running conditions.To decrease running injuries and provide a theoretical refer-ence for scientific training and sports injury prevention.Methods:Fifteen novice female runners participated in this study,using the Vicon three-dimensional motion capture system and Kistler three-dimensional force plate to collect lower limb kinematics and kinematic data pre and post-running fatigue.Running fatigue was induced by increasing treadmill speed starting at 13.3 km/h until the subjects could no longer continue running.The criteria for fatigue in-cluded:①the inability to continue running;②a Borg scale of perceived exertion score of 17 or above;③reaching 90%of maximum heart rate(HRmax 220-age).Data were analyzed using paired sample T-tests and Statistical Parametric Mapping(SPM)1 D from SPSS.Results:①Compared to pre-fatigue running,the hip peak extension angle,the hip joint's range motion,and ankle peak plantar flexion angular velocity significantly increased in the post-fatigue running(P<0.05);②ankle peak dorsiflexion moment was significantly decreased,but the knee peak exten-sion moment was significantly increased(P<0.05);③ankle peak dorsiflexion power,ankle peak plantar flexion pow-er,hip peak flexion power were significantly increased in the post-fatigue running conditions.Conclusions:The lower limb biomechanical variables were significantly changed after the fatigue running,especially in the large hip peak extension angles and range motion of the hip joint,which could lead to increasedhip joint force and increased risk of hip joint injuries.The redistribution of power from the distal ankle to the proximal knee post-fatigue suggests a heightened risk of knee injuries.Therefore,novice female runners should undertake scientifically based training,properly schedule running volumes,and enhance lower limb strength exercises to reduce the risk of injuries caused by running fatigue.
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