51. Metabolic characteristics of Africans with normal glucose tolerance and elevated 1-hour glucose: insight from the Africans in America study
- Author
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Anne E. Sumner, Michael Bergman, Lilian Mabundo, Thomas Hormenu, Marshall K. Tulloch-Reid, Arthur Sherman, Sara M. Briker, Stephanie T. Chung, Joon Ha, and Christopher Dubose
- Subjects
Blood Glucose ,Male ,insulin secretion ,endocrine system diseases ,Endocrinology, Diabetes and Metabolism ,Cohort Studies ,0302 clinical medicine ,Insulin-Secreting Cells ,insulin resistance ,Insulin ,030212 general & internal medicine ,Oral glucose tolerance ,Normal glucose tolerance ,Drug Tolerance ,Prognosis ,Normal lipid ,African-origin populations ,Female ,hormones, hormone substitutes, and hormone antagonists ,Adult ,medicine.medical_specialty ,Cardiovascular and Metabolic Risk ,African descent ,030209 endocrinology & metabolism ,oral glucose tolerance test ,Diseases of the endocrine glands. Clinical endocrinology ,Prediabetic State ,03 medical and health sciences ,Insulin resistance ,Internal medicine ,Diabetes mellitus ,medicine ,Diabetes Mellitus ,Humans ,Insulin secretion ,Glycated Hemoglobin ,business.industry ,nutritional and metabolic diseases ,Glucose Tolerance Test ,medicine.disease ,RC648-665 ,Black or African American ,Endocrinology ,Glucose ,business ,Dyslipidemia ,Biomarkers ,Follow-Up Studies - Abstract
IntroductionRisk of insulin resistance, dyslipidemia, diabetes and cardiac death is increased in Asians and Europeans with normal glucose tolerance (NGT) and 1-hour glucose ≥8.6 mmol/L. As African descent populations often have insulin resistance but a normal lipid profile, the implications for Africans with NGT and glucose ≥8.6 mmol/L (NGT-1-hour-high) are unknown.ObjectiveWe performed oral glucose tolerance tests (OGTTs) in 434 African born-blacks living in Washington, DC (male: 66%, age 38±10 years (mean±SD)) and determined in the NGT group if either glucometabolic or lipid profiles varied according to a 1-hour-glucose threshold of 8.6 mmol/L.MethodsGlucose tolerance category was defined by OGTT criteria. NGT was subdivided into NGT-1-hour-high (glucose ≥8.6 mmol/L) and NGT-1-hour-normal (glucose ResultsOne-hour-glucose ≥8.6 mmol/L occurred in 17% (47/272) with NGT, 72% (97/134) with pre-diabetes and in 96% (27/28) with diabetes. Both insulin resistance and beta-cell function were worse in NGT-1-hour-high than in NGT-1-hour-normal. Dyslipidemia occurred in both the diabetes and pre-diabetes groups but not in either NGT group. One-hour glucose concentration ≥8.6 mmol/L showed substantial agreement for the two OGTTs (к=0.628).ConclusionsAlthough dyslipidemia did not occur in either NGT group, insulin resistance and beta-cell compromise were worse in NGT-1 hour-high. Subdividing the NGT group at a 1-hour glucose threshold of 8.6 mmol/L may stratify risk for diabetes in Africans.
- Published
- 2020