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- Title
Diurnal Pattern to Insulin Secretion and Insulin Action in Healthy Individuals.
- Authors
Saad, Ahmed; Man, Chiara Dalla; Nandy, Debashis K.; Levine, James A.; Bharucha, Adil E.; Rizza, Robert A.; Basu, Rita; Carter, Rickey E.; Cobelli, Claudio; Kudva, Yogish C.; Basu, Ananda
- Abstract
Evaluation of the existence of a diurnal pattern of glucose tolerance after mixed meals is important to inform a closed-loop system of treatment for insulin requiring diabetes. We studied 20 healthy volunteers with normal fasting glucose (4.8 ± 0.1 mmol/L) and HbA1c (5.2 ± 0.0%) to determine such a pattern in nondiabetic individuals. Identical mixed meals were ingested during breakfast, lunch, or dinner at 0700, 1300, and 1900 h in randomized Latin square order on 3 consecutive days. Physical activity was the same on all days. Postprandial glucose turnover was measured using the triple tracer technique. Postprandial glucose excursion was significantly lower (P < 0.01) at breakfast than lunch and dinner. β-Cell responsivity to glucose and disposition index was higher (P < 0.01) at breakfast than lunch and dinner. Hepatic insulin extraction was lower (P < 0.01) at breakfast than dinner. Although meal glucose appearance did not differ between meals, suppression of endogenous glucose production tended to be lower (P < 0.01) and insulin sensitivity tended to be higher (P < 0.01) at breakfast than at lunch or dinner. Our results suggest a diurnal pattern to glucose tolerance in healthy humans, and if present in type 1 diabetes, it will need to be incorporated into artificial pancreas systems.
- Subjects
TREATMENT of diabetes; GLUCOSE tolerance tests; HYPOGLYCEMIC agents; ENDOCRINE diseases; DIABETES complications
- Publication
Diabetes, 2012, Vol 61, Issue 11, p2691
- ISSN
0012-1797
- Publication type
Article
- DOI
10.2337/db11-1478