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Yoon Ho Choi  (Choi YH) 4 Articles
Maximal Oxygen Uptake (VO2max) and Metabolic Syndrome.
Mira Kang, Ji Dong Sung, Byung Chul Yoo, Yoon Ho Choi, Sae Young Jae, Jae Hoon Chung, Yong Ki Min, Myung Shik Lee, Kwang Won Kim, Moon Kyu Lee
Korean Diabetes J. 2005;29(1):65-71.   Published online January 1, 2005
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AbstractAbstract PDF
BACKGROUND
A number of studies have demonstrated an inverse relationship between cardiorespiratory fitness and metabolic syndrome. However, whether the maximal oxygen uptake (VO2max) is dependent on the number of metabolic components or on particular metabolic component remains to be assessed. METHODS: A total of 1,432 Korean subjects were studied. Each individual was assessed for the presence of metabolic syndrome using the modified NCEP-ATP III criteria. All subjects underwent a graded symptom-limited maximal exercise test to determine their VO2max, using a treadmill according to the Bruce protocol. RESULTS: The age-adjusted prevalence of metabolic syndrome in all subjects was 20.4%. The odds ratios for metabolic syndrome were higher in men, the elderly, the obese and those with a lower VO2max. The difference in the VO2max was dependent only on the presence of metabolic syndrome, not on the number of components. CONCLUSION: There were no significant differences in the VO2max according to the presence of particular metabolic components. These results suggest that the VO2max reflects the metabolic syndrome state, rather than the metabolic components, and might be a factor in determining metabolic syndrome
Prevalence of Diabetes Mellitus in Pancreatic Cancer Patients.
Yu Jeong Park, Kwang Won Kim, Eun Young Oh, Yong Ki Min, Myung Shik Lee, Moon Kyu Lee, Jong Kyun Lee, Kyu Taek Lee, Yong Il Kim, Yoon Ho Choi
Korean Diabetes J. 2001;25(4):316-322.   Published online August 1, 2001
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AbstractAbstract PDF
BACKGROUND
Pancreatic cancer is a highly malignant tumor and its incidence has been significantly increased. It has well been known that pancreatic cancer patients had high prevalence of diabetes mellitus. But it is still controversial if diabetes predispose pancreatic cancer or it is an epiphenomenon of pancreatic cancer. Thus, the aims of this study was to investigate the prevalence of diabetes mellitus in pancreatic cancer patients in Korea, to characterize the diabetes mellitus in this situation, and to observe an association between the two conditions. METHOD: 275 pancreatic cancer patients admitted in Samsung Medical Center from January 1998 to December 2000 were selected for this study. We reviewed patients medical record and recorded diabetic history. Subjects who visited our Health Promotion Center in 1999 was used to evaluate the prevalence of diabetes mellitus. RESULT: 30% of pancreatic cancer patients had diabetes mellitus. 60% of diabetic pancreatic cancer patients had detected diabetes within recent two years. 25.6% of them had been known their diabetic state when they detected pancreatic cancer. There were no differences in smoking history, percent of distant metastasis, frequency of curative resection, and BMI between diabetic and nondiabetic pancreatic cancer patients. Significant weight loss was noted in pancreatic cancer patients with diabetes (p<0.01). CONCLUSION: The prevalence rate of diabetes in pancreatic cancer patient was significantly high. Pancreatic cancer patients with diabetes presented with much profound weight loss. Furthermore, more than half of the pancreatic cancer patients with diabetes had recent onset diabetes. Further investigations would be necessary to elucidate causal relation in the pathogenesis of diabetes and pancreatic cancer.
Insulin Secretion and Insulin Sensitivity in Korean Subjects with Impaired Glucose Intolerance.
Dong Jun Kim, Jong Ryul Hahm, In Kyoung Jeong, Tae Young Yang, Eun Young Oh, Yoon Ho Choi, Jae Hoon Chung, Yong Ki Min, Myung Shik Lee, Moon Kyu Lee, Kwang Won Kim
Korean Diabetes J. 2000;24(3):356-364.   Published online January 1, 2001
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AbstractAbstract PDF
BACKGROUND
Although insulin resistance has been known to be a primary defect causing type 2 diabetes in Pima Indians and Caucasians. However, insulin secretory defect rather than insulin resistance has been speculated and demonstrated to be a more important factor in the development of type 2 diabetes in other ethnic groups. Thus, we undertook this study to investigate the initial abnormality of glucose intolerance in Korean subjects. METHODS: 374 Korean subjects were stratified according to the World Health Organization criteria (normal glucose tolerance [NGT], n = 128; impaired glucose tolerance [IGT], n=128; diabetes, n=118) and subdivided further into the two groups; non-obese (BMI < 25 kg/m2) and obese group (BMI 25 kg/m2). Insulinogenic index (the ratio of the increment of insulin to that of plasma glucose 30 min after glucose load) was used as an index of early-phase insulin secretion. AUC insulin (area under the insulin curve during OGTT) was used as an index of total insulin secretion. Insulin resistance was assessed by HOMA (R), the R value of the Homeostasis model. RESULTS: Insulinogenic index decreased significantly in IGT compared with that in NGT in both non-obese and obese groups, respectively. There was no significant difference in AUC insulin and HOMA (R) between NGT and IGT group. WhereasAUC insulin showed its peak level in the range of IGT (7.7~9.9 mmol/L), insulinogenic index showed the peak level in the range of NGT (5.6~7.7 mmol/lL and decreased progressively with increase of plasma glucose 120 min value. CONCLUSION: Early-phase insulin secretory defect might be the initial abnormality in the development of IGT from NGT in both non-obese and obese Korean subjects.
Plasma leptin Concentrations in Korean Type 2 Diabetic Patients.
Eun Young Oh, Yun Jae Chung, Yoon Ho Choi, Jae Hoon Chung, Yong Ki Min, Myung Shik Lee, Moon Kyu Lee, Kwang Won Kim
Korean Diabetes J. 1998;22(4):531-537.   Published online January 1, 2001
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AbstractAbstract PDF
BACKGROUND
Obesity is a well-established risk factor for a number of chronic diseases, including type 2 diabetes mellitus, hypertension, cardiovascular disease, and hyperlipidemia. Leptin, the protein procluct of the ob gene, is increased in obese individuals, suggesting resistance to its effect. We investigated whether the subjects with type 2 diabetes have an altered regulation of serum leptin levels METHODS: 205 Korean type 2 diabetic patients and 174 normal contro1 subjects participated in this study. We evaluated a difference between leptin level of diabetic patients and that of normal controls. In diabetic patients, correlations among plasma leptin concentration and other factors such as serum insulin concentration, percentage body fat, BMI, gender, total cholesterol, triglyceride, and fasting serum glucose level were evaluated. RESULTS: Fasting plasma leptin concentrations were correlated to BMI, percentage body fat, gender and serum insulin concentration. Plasma leptin concentrations are not significantly different in diabetic subjects compared to controls. CONCLUSIONS: We conclude that there was no significant difference in semm leptin level between type 2 diabetic and normal subjects and that body fat, sex, and the fasting insulin level are independently associated with plasma leptin level in type 2 diabetic patients.

Diabetes Metab J : Diabetes & Metabolism Journal