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Insulin sensitivity in physically fit and unfit children of parents with Type 2 diabetes

 C. W. Ahn  ;  Y. D. Song  ;  K. B. Huh  ;  H. C. Lee  ;  J. H. Lee  ;  K. R. Kim  ;  S. K. Lim  ;  B. S. Cha  ;  S. W. Park  ;  S. O. Woo  ;  D. M. Kim  ;  J. H. Nam 
 DIABETIC MEDICINE, Vol.21(1) : 59-63, 2004 
Journal Title
Issue Date
Administration, Oral ; Adult ; Area Under Curve ; Blood Glucose/analysis ; Diabetes Mellitus, Type 2/genetics* ; Exercise* ; Glucose/administration & dosage ; Glucose Tolerance Test/methods ; Humans ; Insulin/blood ; Insulin Resistance/genetics* ; Male ; Parents ; Swimming
AIMS: First-degree relatives of patients with Type 2 diabetes mellitus (T2DM) are often reported to be insulin resistant. We wanted to identify early metabolic abnormalities in this condition, and determine whether they are altered by regular physical training. METHODS: We measured insulin sensitivity using the euglycaemic glucose clamp technique and insulin response to oral glucose in 10 unfit (did not participate in routine physical exercise) offspring of T2DM parents and 10 unfit control subjects, and compared them with six fit (routinely swam for 3 h/day 5 days/week) offspring of T2DM parents and six fit controls with no family history of T2DM. RESULTS: Unfit offspring had a higher plasma glucose response than the other three groups. The mean area under the glucose curve was also significantly higher in unfit offspring than in the other three groups (12.6 +/- 0.6 vs. 10.4 +/- 0.4, 9.6 +/- 0.5, and 9.5 +/- 0.7 mmol/l per hour for the unfit controls, fit offspring and fit controls, respectively; P < 0.05). The corresponding insulin response of unfit offspring was significantly higher at 60 min in the oral glucose tolerance test (OGTT) that that of fit offspring or fit controls. In addition, the mean area under the insulin curve was significantly greater in unfit offspring than in either fit offspring or fit controls (868 +/- 172 vs. 294 +/- 71, 287 +/- 43 mmol/l per hour, respectively; P < 0.05). Moreover, the glucose disposal rate (GDR), measured using a euglycaemic clamp, was significantly lower in unfit and fit offspring than in unfit and fit controls (5.6 +/- 0.3 vs. 8.6 +/- 0.3 mg/kg per minute; P < 0.01 and 9.3 +/- 0.9 vs. 12.1 +/- 0.8 mg/kg per minute, respectively; P < 0.015), whereas the GDR was similar in unfit controls and fit offspring (8.6 +/- 0.4 vs. 9.3 +/- 0.9 mg/kg per minute; P > 0.05). CONCLUSION: These results support the concept that early metabolic abnormalities, as reflected by a decreased GDR (insulin sensitivity) in the offspring of T2DM patients, may be improved by increased physical fitness.
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1. College of Medicine (의과대학) > Dept. of Internal Medicine (내과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Kyung Rae(김경래)
Ahn, Chul Woo(안철우) ORCID logo https://orcid.org/0000-0003-3733-7486
Lee, Hyun Chul(이현철)
Lim, Sung Kil(임승길)
Cha, Bong Soo(차봉수) ORCID logo https://orcid.org/0000-0003-0542-2854
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