• Journal of the Korean Applied Science and Technology
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• v.38 no.3
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• pp.851-859
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• 2021

The purpose of this study was to investigate the effects of six weeks of plyometric training on Sargent jumps, posture control, and lower extremity injury criterion in Taekwondo demonstrator. Twenty healthy collegiate Taekwoondo demontrators were randomly assigned to either an exercise group (Ex = 10), and a control group (Con = 10), Con maintained their normal Taekwoondo demontration training schedule. Whereas Ex group completed the plyometric program in three times a week, 60 minute for 6 weeks. Testing before and after training include the Sargent jump, back muscle strength, Y-balance and lower extremity injury criterion. There are no significant increase in back muscle strength, but significant increase in Sargent jump. In postural control, the anterior was not significant, but there was a significant increase in the left and right posterolateral, posteromedial and the total score showed that there was no risk of injuries. In conclusion, plyometric training is a training method that needs to be actively utilized for power, dynamic posture control, lower extremity injury prevention, and rehabilitation.

• Journal of Advanced Technology Convergence
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• v.1 no.1
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• pp.33-42
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• 2022

The flexors and extensors of the knee joint are essential for maintaining body stability. The purpose of this study was to investigate the correlation between the isokinetic parameters of the knee flexor and extensor muscles and the function of the lower extremity muscles. Twenty-two healthy adults participated in this study. The time to peak torque (TTP), acceleration time (AT), and peak torque (PT) of the knee flexor and extensor muscles were measured. A 20m sprint, Sargent jump, one leg hop test, and side shuffle were measured to evaluate lower extremity function. The correlation between each variable was analyzed using Pearson correlation coefficient. PT of the knee flexor showed a significant correlation with single leg hops and 6M hops in a single leg. PT of knee extensors was found to be significantly correlated with Sargent jumps and triple hops. Based on the results of this study, we suggest that the strength of the knee flexor and extensor muscles has the potential to be used to predict lower extremity function.