Diabetes, Vol 36, Issue 8 892-896, Copyright © 1987 by American Diabetes Association

ARTICLES

Hyperglycemia decreases glucose uptake in type I diabetes

H Yki-Jarvinen, E Helve and VA Koivisto

It has recently been postulated that hyperglycemia per se may contribute to insulin resistance in diabetes. To examine this possibility directly, we measured glucose uptake after 24 h of hyperglycemia (281 +/- 16 mg/dl) and normoglycemia (99 +/- 6 mg/dl) in 10 type I (insulin-dependent) diabetic patients (age 33 +/- 3 yr, relative body wt 102 +/- 3%) treated with continuous subcutaneous insulin infusion. Hyperglycemia was induced by an intravenous glucose infusion, whereas saline was administered during the control day. During both studies the patient received a similar diet and insulin dose. After hyper- and normoglycemia, a primed continuous infusion of insulin (40 mU X m-2 X min-1) was started, and plasma glucose was adjusted to and maintained at 142 +/- 2 and 140 +/- 2 mg/dl, respectively, during 60-160 min of insulin infusion. The rate of glucose uptake after hyperglycemia averaged 8.3 +/- 1.1 mg X kg-1 X min-1, which was lower than the rate after the normoglycemic period (10.1 +/- 1.2 mg X kg-1 X min-1, P less than .001). In conclusion, short-term hyperglycemia reduces glucose uptake in type I diabetic patients. Thus, part of the glucose or insulin resistance in these patients may be caused by hyperglycemia per se.
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