Type 1 Diabetes Clinical Trial
Official title:
Effect of Postprandial Hyperglycemia on Vasculature in Type 1 Diabetes and Healthy Adults
To the investigator's knowledge, there are no data available in the current literature regarding the acute effects of postprandial hyperglycemia and insulin timing on myocardial perfusion in people with type 1 diabetes (T1D). Observational studies using CEU in type 2 diabetes demonstrate that postprandial hyperglycemia determines myocardial perfusion defects. The investigator hypothesizes that the combination of postprandial hyperglycemia and insulin increases pulse wave velocity (i.e., aortic stiffness) and myocardial vasoconstriction, thereby reducing myocardial perfusion in T1D when compared to healthy controls. Furthermore, the investigator hypothesizes in T1D that dosing insulin before meal intake will ameliorate these cardiovascular defects.
The investigator will compare 17 T1D and 17 age-, sex-, and BMI-matched healthy controls (18-35 yrs) measuring pulse wave velocity (PWV), flow-mediated dilation (FMD) and myocardial perfusion (contrast enhanced ultrasound [CEU]) before and 2 hours after ingesting a mixed meal (40% of each subject's daily estimated caloric need, with 50%, 30%, 20% from carbohydrates, fat and protein, respectively). T1D participants will have 2 study admissions: A) injection of insulin 15 minutes before ingesting a mixed meal. B) injection of insulin 15 min after ingesting a mixed meal. ;
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