Abstract
In search of early signs of autonomic and vascular dysfunction in diabetic subjects, six young men with type I diabetes and six healthy subjects were investigated regarding arterial levels of noradrenaline (NA), neuropeptide Y- (NPY) and endothelin-1-(ET-1) like immunoreactivity (Li) during and after 1 h of exercise at 70% of peak oxygen uptake. Basal NA, NPY-Li and ET-1-Li levels did not differ between groups. NA and NPY-Li rose during exercise in diabetic subjects to only 60% of the control values (P < 0.05, interaction group x time P < 0.001). Disappearance rates for NA and NPY-Li did not differ between groups. Plasma ET-1-Li did not differ between groups during exercise. Values returned to basal levels within 5 min in the diabetic but not in the control group. In conclusion, diabetic subjects show lower NPY-Li and NA levels than control subjects during exercise but similar disappearance rates after exercise, indicating lower releases. Furthermore, plasma ET-1 levels did not differ between groups during exercise.
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