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Invited Review : Clinical and Basic Studies of Muscle Strain Injury
( Koichi Nakazato ),( Kih Yok Lee ),( Karina Kouzaki ),( Kenji Hiranuma ),( Seok Ki Min ),( Eisuke Ochi ),( Hong Sun Song ) 한국스포츠정책과학원(구 한국스포츠개발원) 2013 International Journal of Applied Sports Sciences Vol.25 No.1
In this review, we gleaned clinical and basic studies of muscle strain injury. In clinical situation, thigh muscles, especially hamstrings, are frequently suffered. Sudden eccentric contraction (EC), imbalance of muscle strength, preexisting strain injuries are significant risk factors. Magnetic resonance and ultrasonography imaging provides useful information for diagnosis and care. Atrophy and scar formation can be raised as characteristics in chronic change. Despite of these information, definition and classification for strain injury is still under development. In basic aspect, EC-induced muscle damage is frequently used as a muscle strain injury model. With in vivo EC model, we showed that (1) cellular myogenic events are associated with torque recovery after EC-induced muscle injury, (2) muscle protein degradation is induced by severe ECs. To reproduce unique events in muscle strain injury, such as muscle atrophy, fibrosis and recurrence, is a key to simulate muscle strain injury in animal and human models.
Association between Asporin gene and lumbar disc degeneration in Japanese collegiate athletes
( Min Seok-ki ),( Nakazato Koichi ),( Hiranuma Kenji ),( Kim Tae-whan ) 한국체육대학교 체육과학연구소 2017 스포츠사이언스 Vol.35 No.1
Recently, aspartic acid (D)-repeat of the asporin (ASPN) gene was shown to be associated with lumbar disc degeneration in Asian population. Our objective was to test whether the D-repeat polymorphism was associated with lumbar disc degeneration (LDDG) in Japanese collegiate athletes. We determined ASPN polymorphism amongst 516 trained collegiate athletes (341 men, 175 women, experience 8.5±3.5) from 7 different sports. We separated FAM-labeled polymerase chain reaction (PCR) products containing the D-repeat polymorphism of ASPN by size. LDDG was evaluated based on the signal intensity of T2-weighted magnetic resonance imaging. By using logistic regression analysis concomitant with interaction term and the Wald tests, D14 allele of the ASPN gene was associated with an increased risk of LDDG in collegiate athletes (Odds ratio (OR); 2.14, 95% confidence interval (CI); 1.1-4.18, P=0.025). Also, the D13 allele is under-represented in collegiate athletes with LDDG (OR; 1.86, 95% CI; 1.16-2.98, P=0.009). However, ASPN polymorphism was not a risk factor for female collegiate athletes. We concluded that the ASPN gene is a significant risk factor for LDDG occurrence in Japanese collegiate male athletes.
Field Test of Contra-Rotating Small Hydroturbine
Toru Shigemitsu,Takumi Omori,Yuya Hiraishi,Takashi Tsuda,Takayuki Kawanami,Kenji Hiranuma,Takuji Hosotani,Ding Nan 한국유체기계학회 2023 International journal of fluid machinery and syste Vol.16 No.2
The contra-rotating small hydroturbine can be applied to pipelines of agricultural water and for farming river fishes. In the previous research, the advantages of the contra-rotating small hydroturbine were verified by the numerical analysis and experimental apparatus of our lab. The diameter of our test model was small as 58mm and it have to be scaled up to apply it to the actual case of a pipeline for farming river fishes. Therefore, we made the diameter of our test model larger, which is suitable for the pipeline for farming river fishes. The numerical analysis was conducted to check the power of the large-scale model for the pipeline. Furthermore, the parameter study related to the solidity, blade number and setting angle, was conducted to increase the power of the hydroturbine using the numerical analysis. After that, the suitable impeller for the field test was chosen and an experimental apparatus for the field test was established. The power generation at different flow rate conditions was measured by the experiment and the stability of the experimental apparatus; leakage flow from the mechanical seal, vibration, noise of the turbine, was checked in the field test. In this paper, our developing process of the contra-rotating small hydroturbine is shown and the prospect to apply our test turbine for the pipelines is discussed based on the numerical analysis and field test results.