This research aims to investigate the changes in static and dynamic balance and proprioceptive accuracy of knee and ankle joints of young taekwondo athletes before and after applying the fatigue protocol. The current research is semi-experimental. The research subjects were 20 teenage male taekwondo players (17/86±4/4 year, 174/37±5/2 cm, 65/61±6/1 kg) from the statistical population. Static and dynamic balance variables were measured respectively by Stork's static balance test and Y dynamic balance test, as well as the proprioception of the ankle and knee joints at 10 degrees of ankle dorsiflexion and 30 degrees of knee flexion, by the photographic method. Then the functional fatigue protocol was applied. After finishing the fatigue protocol, all the variables evaluated again. The results of the paired t-test showed that after applying the fatigue protocol, there is a significant difference between the average of static (P=0.028) and dynamic balance in all three anterior (P=0.001), posterior-medial (P=0.012) and posterior-lateral (P=0.009) directions as well as proprioceptive accuracy of knee joint (P=0.003) and ankle joint (P=0.001).
It is recommended to all taekwondo coaches and athletes, to perform specialized training exercises in the field of taekwondo and according to the age of teenagers.
