
To investigate changes in cardiac repolarization during exercise-related hypoglycemia compared to hypoglycemia induced at rest in people with type 1 diabetes. Both QTc and Tpe intervals significantly increased from baseline during the hypoglycemic phase, but there was no significant difference between test days. These changes were accompanied by an increase in plasma adrenaline and a decrease in potassium on both days. During the recovery phase, the ΔQTc interval was longer during clamp rest compared to clamp exercise, whereas the ΔTpe interval remained similar on the two test days. They found that exercise‐related hypoglycemia and hypoglycemia induced at rest can cause QTc‐interval prolongation and Tpe‐interval prolongation in people with type 1 diabetes. Thus, both scenarios may increase susceptibility to ventricular arrhythmias.
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