| Summary: | 碩士 === 國立成功大學 === 物理治療學系 === 103 === Background and Purpose: Knee injuries such as anterior cruciate ligament injuries and patella-femoral pain syndrome are commonly seen in volleyball players. Valgus position and momentum of lower extremities, including knee abduction, knee internal rotation, hip adduction and hip internal rotation, are considered as primary risk factors of ACL and PFPS injury. Deficits of core stability and altered trunk alignment were also observed in athletes with knee injuries. Improving core stability and proximal joint control is thus believed to be able to reduce knee injuries and even improve sports performance. The main purpose of this study was to determine the effects of 6-weeks core and hip stabilization training program on lower extremity muscle strength and sports performance in young male volleyball players. Methods: A total of 16 participants were recruited from Cian-Jhen junior high school volleyball team. Before and after-intervention, all participants received isokinetic strength testing for major lower extremity muscle groups, kinematics of lower extremities, and several sports performance. The 6 weeks training program was progressed by three stages, focusing on muscles like transversus abdominis, multifidus, gulteal and pelvic floor muscles. Paired t-tests were used to compare the pre- and post- data using the SPSS Statistics 17.0 software (SPSS, Chicago, IL). Results: After training, the isokintic strength shows significant improvement on hip flexor and external rotator, knee flexor and extensor of dominant leg and hip extensor, internal rotator and knee extensor on non-dominant leg. The kinematics of lower extremities also shows positive change of movement pattern on knee internal rotation and trunk deviations during landing during landing tasks. However, the results of sports performance shows no significant improved after training. Discussions: The results of this study provided the evidence for core combined with hip stabilization training to improve lower extremity strength, kinematics of lower extremities and potentially enhance sports performance in young male volleyball players. Researching is needed for more information. Such program may be beneficial for reduced knee injuries; however, this notion still needs further investigation.
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