GLP-1 receptors are widely distributed including on the endothelial cells in both coronary and skeletal muscle circulation and on the myocardium. GLP-1-receptor studies on knock-out mice have shown that they exhibit a reduced myocardial contractility and reduced diastolic heart function. GLP-1 also shows beneficial cardiovascular effects in patients with acute myocardial infarctions and dogs with dilated cardiomyopathy in that the left ventricle function and endothelial dysfunction improves after GLP-1 treatment via insulin-independent mechanisms. Preclinical studies indicate that exogenous administrated GLP-1 in physiological concentrations can improve perfusion but this has never been tested in humans. It is also unknown whether GLP-1 can directly increase the glucose/metabolite uptake across both cardiac and skeletal muscle in an insulin independent manner. Unpublished studies do however indicate that the improvement in the cardiovascular system is largely dependent upon a high blood glucose level and only partially dependent upon the antiglycemic effects of GLP-1.