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정지영(Jiyoung Jeong),신충수(Choongsoo S. Shin) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Dynamic balance is an ability to maintain stable position while performing various tasks and it has been reported that dynamic balance associated with athletic performance and injury risks. The purpose of study was to examine the effect of core strength on dynamic balance. Nineteen males completed 10-week core training interventions. To test the core strength, a trunk endurance test was used. During this test, the plank and side-plank positions were maintained for as long as possible. The star excursion balance test (SEBT) were conducted before and after core training to measure the dynamic balance. Plank records and SEBT parameters were compared using a paired Student’s t-tests at a significance level of 0.05. Greater plank and left/right side plank record were found in post-training (p=0.008, p=0.049, and p=0.007 respectively), thus the core muscle strength increased after training. As the SEBT results, greater anterior, anteromedial, medial, posteromedial, posterior, posterolateral reach distances were found between pre- and post-training, but there was no significant differences in lateral and anterolateral distances. These results indicate that strengthening of core muscle increase the dynamic balance, thereby it positively affected in lower extremity injury risk.
하지 내측 근력 트레이닝이 근 두께 및 질적 파라미터에 미치는 영향
정지영(Jiyoung Jeong),최대혁(Dai-hyuk Choi),김판권(Pankwon Kim),신충수(Choongsoo S. Shin) 대한기계학회 2020 大韓機械學會論文集B Vol.44 No.9
본 연구의 목적은 내측광근과 햄스트링근 내측부를 선택적으로 강화시키기 위한 내측 하지 근력 트레이닝이 근 형태 및 질적 파라미터에 미치는 효과를 규명하는 것이다. 성인 남녀 각 10명은 8주 동안 내측광근과 햄스트링근 내측부 강화 운동을 수행하였다. 트레이닝 전후 내측광근/외측광근과 햄스트링근 내측부/외측부의 초음파 영상을 측정하고 신뢰도를 평가한 결과, 근 두께 및 질적 파라미터에 대해 측정일 및 측정자 간 급내 상관 계수에서 높은 신뢰도를 보였다. 트레이닝 후 근 두께와 에코 강도는 남녀 모두 외측광근과 햄스트링근 외측부에 차이가 없었으나, 내측광근과 햄스트링근 내측부의 근 두께는 통계적으로 유의하게 증가하고, 에코 강도는 감소하였다. 즉, 본 연구에서 수행한 하지 내측 근력 트레이닝 프로그램을 통해 외측 대비 내측 근육을 효과적으로 강화시킬 수 있음을 확인하였다. This study aimed to examine the effect of medial quadriceps- and hamstring-focused strength training on muscle morphology and quality. Ten males and ten females participated in an eight-week strength training program for their medial quadriceps and hamstrings. The ultrasound images of medial/lateral quadriceps and hamstrings were collected before and after this program. Both muscle thicknesses and echo intensity parameters of all measured muscles showed high reliability coefficients. The muscle thickness of medial quadriceps and hamstrings significantly increased post training for both males and females, whereas no difference was observed in the muscle thickness of lateral quadriceps and hamstrings. The echo intensity of medial thigh muscles decreased for both males and females; however, there was no significant difference in the echo intensity of the lateral thigh muscles. Therefore, medial quadriceps- and hamstring-focused strength training can strengthen the medial thigh muscles selectively, and hence can be considered in ACL injury prevention programs.
정지영(Jiyoung Jeong),신충수(Choongsoo Shin) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The purpose of this study was to examine the relationship between thigh muscular parameters and the knee joint kinematics during gait. Sixteen males and fourteen females participated in this study. Both muscle thickness and echo intensity parameters of all individual quadriceps and hamstrings were collected using ultrasound system, and knee joint kinematics during gait at preferred speed were measured using motion capture system. Regression analyses were performed at a significance level of 0.05. Vastus medialis muscle thickness was correlated with knee flexion angle and valgus angle at initial contact. Peak knee flexion angle was correlated with hamstring to quadrecep muscle thickness ratio, biceps femoris echo intensity, and gait stride. Range of motion in frontal plane and transverse plane were correlated with vastus intermedius & vastus medialis echo intensity and semitendinosus & gait speed, respectively. In conclusion, individual thigh muscle structure plays an important role in knee kinematics during gait.