Abstract:
OBJECTIVE:The purpose of this study was to compare an in vivo test of whole-body glycolysis, the deuterated-glucose disposal test (2H-GDT), with insulin sensitivity measured by the euglycemic-hyperinsulinemic glucose clamp and the steady-state plasma glucose (SSPG) test. RESEARCH DESIGN AND METHODS:The 2H-GDT consists of an oral glucose challenge containing deuterated glucose, followed by measurement of heavy water (2H2O) production, which represents whole-body glycolytic disposal of the glucose load. 2H2O production is corrected for ambient insulin concentration as an index of tissue insulin sensitivity. The 2H-GDT was compared with euglycemic-hyperinsulinemic glucose clamps in healthy lean subjects (n = 8) and subjects with the metabolic syndrome (n = 9) and with the SSPG test in overweight (n = 12) and obese (n = 6) subjects. RESULTS:A strong correlation with the clamp was observed for the 75-g and 30-g 2H-GDT (r = 0.95, P < 0.0001 and r = 0.88, P < 0.0001, respectively). The 2H-GDT and clamp studies revealed marked insulin resistance in subjects with metabolic syndrome compared with lean control subjects. The correlation with the clamp was maintained in each group (lean, r = 0.86, P < 0.01; metabolic syndrome, r = 0.81, P < 0.01) for the 75-g test. The 2H-GDT also correlated strongly with the SSPG test (r = -0.87, P < 0.0001) in overweight and obese subjects. CONCLUSIONS:The 2H-GDT, which measures whole-body glycolysis in humans in a quantitative manner, correlates highly with the euglycemic-hyperinsulinemic glucose clamp and the SSPG test. Impaired insulin-mediated whole-body glycolysis is a feature of insulin resistance, which provides a means of assessing insulin sensitivity in vivo.
journal_name
Diabetes Carejournal_title
Diabetes careauthors
Beysen C,Murphy EJ,McLaughlin T,Riiff T,Lamendola C,Turner HC,Awada M,Turner SM,Reaven G,Hellerstein MKdoi
10.2337/dc06-1809subject
Has Abstractpub_date
2007-05-01 00:00:00pages
1143-9issue
5eissn
0149-5992issn
1935-5548pii
dc06-1809journal_volume
30pub_type
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