Abstract:
OBJECTIVE:To describe the impact of abdominal obesity and hepatic insulin resistance on phase-specific glycemic responses in older women. RESEARCH DESIGN AND METHODS:We studied 23 healthy older women (60-88 years old). Abdominal obesity was defined by an abdominal circumference > or =95 cm. Plasma glucose and insulin were measured in response to a 3-h oral glucose tolerance test. Insulin suppression of hepatic glucose production was determined using in vivo clamp techniques. RESULTS:Despite identical prevailing insulin concentrations, glucose excursions 30 min postchallenge (but not later) were greater in women with abdominal obesity than in those without (162 +/- 19 vs. 132 +/- 16 mg/dl; P < 0.01). There was a strong correlation between hepatic glucose production suppression under low-dose insulin infusion and early-phase glucose excursions from the oral glucose tolerance test (r = -0.83; P < 0.001) in women with abdominal obesity, but not in women without (r = 0.44; P < 0.11). CONCLUSIONS:Abdominal obesity relates specifically to early-phase hyperglycemia via hepatic insulin resistance, even in healthy older women.
journal_name
Diabetes Carejournal_title
Diabetes careauthors
DiPietro L,Dziura J,Yeckel CWdoi
10.2337/dc09-1365subject
Has Abstractpub_date
2010-01-01 00:00:00pages
165-7issue
1eissn
0149-5992issn
1935-5548pii
dc09-1365journal_volume
33pub_type
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