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일반노인과 비만노인의 대퇴부 근육량과 근력비교연구(Intermuscular fat을 중심으로)
최승준(Seung-Jun Choi),박성모(Sung-Mo Park),곽이섭(Yi-Sub Kwak) 한국생명과학회 2014 생명과학회지 Vol.24 No.10
본 연구는 65세 이상의 비만노인과 일반노인의 대퇴부 근육량과 등속성 근력을 비교하기 위해 수행되었다. 본 연구의 피험자는 65~79세 사이 노인들을 비만군(BMI>25, N=21)과 일반군(BMI<25, N=13)으로 구성하였다. 본 연구의 목적을 달성하기 위해 대퇴부 근육량 및 지방량 측정 등은 CT 촬영을 통해 측정하였고, 대퇴부 등속성 근력은 BIODEX를 이용해 최대 신전력을 측정하였다. 모든 변인은 two-way ANOVA로 검증한 후 유의한 경우 Contrast test를 통해 사후분석을 실시하였다. 그 결과 대퇴부 총 부피는 남녀 모두 그룹간 유의한 차이가 나타났다. 대퇴부 근육 부피는 비만군 남자가 일반군 남자보다 유의하게 높게 나타났으며 비만군에서 남녀 성별간 유의한 차이를 보였다. 피하지방은 그룹간과 그룹내 성별간 유의한 차이가 나타났으며, 근간지방의 경우 비만군과 일반군의 동일 성별간에서만 유의한 차이가 나타났다. 또한 근간지방은 일반군 남자에서 비만인 남자에 비해 유의하게 높게 나타났으며 성별간 유의한 차이도 확인되었다. 이상의 연구 결과를 종합해보면 비만 노인은 일반노인보다 남녀 모두 큰 대퇴부 근육 부피를 가지고 있음에도 불구하고, 단위 체중당 대퇴부 근력은 일반노인이 높은 것으로 나타났다. 이는 비만노인에 비해 일반노인의 근육기능이 생리적으로 더 우수하다는 것을 의미한다. The purpose of this study was to investigate the relationship between quadriceps composition and its functional contractility in obese and nonobese elderly individuals. Thirty-four (70±2 yr) individuals (obese, n=21; nonobese, n=13) participated in the study. The thigh composition was assessed with a CT scan, and its functional contractility was measured with an isotonic dynamometer. Variables were analyzed with a 2×2 two-way ANOVA and a contrast test (p<0.05). There were no between-group differences in the subjects’ ages and heights, but individuals in the obese group were approximately 23% heavier and had 18% more fat than those in the nonobese group, regardless of gender. The total thigh volume of the obese elderly was greater (~29%) than that of the nonobese elderly, regardless of gender, and the fat volume (~39%) of the obese elderly was greater than that of the nonobese elderly, regardless of gender (p<0.05). Interestingly, the obese elderly tended to have a greater thigh muscle volume (~17% for males [p<0.05] and ~10% for females) than the nonobese. Despite the greater muscle volume, the peak knee extensor torque of the two groups was comparable or slightly greater in the obese individuals. However, when this was normalized by the total thigh volume, the nonobese males showed significantly greater peak torque (~26% for right and ~20% for left; p<0.05) compared to the obese males. The nonobese females also showed greater peak torque (~8% for both legs) than the obese females after normalization, but the result was not statistically significant. In conclusion, although the obese elderly individuals had greater quadriceps muscle mass than the nonobese, the normalized peak torque of the obese was significantly lower than that of the nonobese, implying a lower degree of muscle contractility.
Zr-2.5Nb 압력관에서의 Striation Spacing과 DHCV의 관계
최승준(Seung Jun Choi),안상복(Sang Bok Ahn),김성수(Sung Soo Kim),임경수(Kyoung Soo Im),김영석(Young Suk Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.8
The objective of this study is to elucidate a relationship between striation spacing and DHCV in Zr-2.5Nb tubes. To this end, DHC tests were conducted at different temperatures ranging from 100 to 300 oC with 3 to 6 data set at each test conditions for data confidence. Hydrogen charging amount was determined with testing temperature, from 27 to 87 ppm. Before applying load, specimens were heated up in order to dissolve hydrogen into matrix, and cooled down to testing temperature. From the results, DHCV and striation spacing increased with increased testing temperature, leading to a apparent relation that striation spacing became larger with increased DHCV. However, through a normalization of DHCV by diffusivity and solubility of hydrogen, it is found that the DHCV decreased with increased striation spacing. This correlation of the striation spacing and the DHCV was confirm through DHC tests on irradiated Zr-2.5Nb tubes with higher yield strength demonstrating the higher DHCV with the smaller striation spacing.
압연이 Ni-MH 2차전지용 금속수소화물 전극의 충 · 방전 특성에 미치는 영향
박원(Won Park),장상민(Sang Min Chang),최승준(Seung Jun Choi),노학(Hak Noh),최전(Jeon Choi),박충년(Choong Nyeon Park) 한국수소및신에너지학회 1996 한국수소 및 신에너지학회논문집 Vol.7 No.2
The effect of rolling on the charge-discharge property was studied for metal hydride negative electrode. (LM)Ni<sub>3.6</sub>Al<sub>0.4</sub>Co<sub>0.7</sub>Mn<sub>0.3</sub>(pleateau pressure : below 1 atm at room temperature, volume expansion : 9%, entalpy : 8.7㎉/㏖H₂) alloy was prepared by arc melting, and then it was coated with various copper weight percent. The copper coated alloys were then rolled with the different reduction ratio. From the results, it was found that the maximum discharge capacity increased with increasing reduction ratio, and 15wt% copper coated sample shows the highest discharge capacity, 324㎃h/g, after rolling with 30% reduction ratio. In view of cycle life for the negative electrode, the 15wt% copper coated electrode which was rolled with 13% reduction ratio showed the longest cycle life compared with other electrodes.
8주간의 진동 운동 프로그램이 남,녀 대학생의 하지 최대 근력과 균형 능력에 미치는 영향
하경진 ( Kyung Jin Ha ),이상열 ( Sang Yeol Lee ),최승준 ( Seung Jun Choi ) 대한물리의학회 2015 대한물리의학회지 Vol.10 No.4
PURPOSE: Application of an oscillating program for the lower extremities is an effective training method for increasing muscle strength. However, no oscillatory program has yet been identified to confirm the effectiveness of oscillation for balance ability and maximum muscle strength. We investigated the effects of an 8-week vibration exercise program on the maximum muscle strength and balance of the lower extremities. METHODS: Research subjects participating in the study were 22 male and female college students with no past history of diseases of the nervous or musculoskeletal systems. All subjects were randomly divided into two groups and performed their assigned experimental treatment 3 times a week over a period of 20 min for 8 weeks. Maximum strength of the quadriceps extension, flexion, and balance ability were measured using Biodex System 4 and Biodex balance systems. RESULTS: The 8-week oscillation program resulted in a significant increase in quadriceps extension and flexion strength in both male and female participants (p<.05). The balance ability also showed a significant improvement after the oscillation program (p<.05). The balance value was higher for male 17% than for female 21% (p<.05) participants. CONCLUSION: An 8-week oscillation program led to an increase in the strength of knee flexion and extension. The balance ability also improved significantly. This positive effect on balance ability was higher in female than in male subjects.
악성위궤양으로 오인된 거대세포바이러스 위염: AIDS 진단으로 이어진 초기 발현양상으로서의 증례 1예
나수지 ( Su Sie Rah ),권혁춘 ( Hyeok Choon Kwon ),최승준 ( Sung Jun Choi ),남승우 ( Seong Woo Nam ),박상민 ( Sang Min Park ),최한섭 ( Han Seop Choi ),문가슬 ( Ga Seul Moon ),이승훈 ( Seung Hun Lee ),박성균 ( Sung Kyun Park ) 전북대학교 의과학연구소 2011 全北醫大論文集 Vol.35 No.1
CMV 감염은 주로 면역기능이 저하된 환 자에서 흔한 기회감염으로 상부 위장관에서 의 내시경 소견은 경미한 발적에서부터 궤 양까지 다양하다. 저자들은 흑색변을 주소로 내원한 환자에서 내시경적으로는 악성궤양 의 소견을 보였으나 궤양부위 조직검사상 거대세포바이러스 봉입체를 관찰하여 CMV 감염에 의한 궤양으로 진단되었고 면역억제 의 원인을 추적하여 HIV 감염을 확인한 증례가 있어 보고하는 바이다. Cytomegalovirus (CMV) causes a wide spectrum of disorders in immunocompetent and immunocompromised patients, however it is more frequent and raises more clinical concerns in immunocompromised patients due to its severity. Moreover, suspicion or recognition of gastrointestinal CMV infection by routine laboratory tests and endoscopy with biopsy is difficult since blood tests and pathology do not always reveal the clues for immune deficiency such as leukopenia or inclusion bodies-the hallmark of CMV infection and also due to the lack of specific endoscopic findings. We report a case of an HIV infection without leukopenia whose initial presentation was a solitary CMV gastric ulcer, which initially was suspected as an advanced gastric cancer with melena.
유지원 ( Ji Won Ryu ),남승우 ( Seong Woo Nam ),권혁춘 ( Hyuck Choon Kweon ),최승준 ( Song Jun Choi ),김상용 ( Sang Young Kim ),박현미 ( Heun Mi Park ),안혜선 ( He Sun An ) 전북대학교 의과학연구소 2010 全北醫大論文集 Vol.34 No.2
저자들은 만성 설사와 하지 부종을 주소로 내원한 63세 여자 환자에서 류마티스 관절염과 연관되고 대장에 국한된 속발성 유전분증을 진단하였고 환자의 임상경과를 기존의 문헌 고찰과 함께 보고하는 바이다. Suspicion of gastrointestinal amyloidosis in patients without known history of amyloidosis is difficult, but gastrointestinal amyloidosis should be considered in those older than 30year with unexplained diarrhea, weight loss or malabsorption. We experienced a case of an 63-year-old female in patient with rheumatoid arthritis, who have a chronic watery diarrhea caused by colonic amyloidosis. Congo-red stain and immunohistochemical stain for amyloid A protein of colonoscopic pathologic specimen showed positive response. Other organs such as kidney, heart, liver and skin, were not involved by amyloidosis. She was diagnosed to secondary and localized colonic amyloidosis related with rheumatoid arthritis. In spite of anti-rheumatic therapy, our patient did not recover.