Glucose disposal rates calculated from 60- to 90-minute isoglycemic hyperinsulinemic glucose clamp correlate with cardiovascular risk factors in borderline hypertensive young men.
The hyperinsulinemic glucose clamp is generally performed for at least 120 minutes, due to assumptions of steady-state. We were interested in relationships between glucose disposal rate (GDR) and cardiovascular risk factors, rather than a standard measure of insulin sensitivity per se. Therefore, we analyzed 120-minute clamps performed on borderline hypertensive, but otherwise healthy young men (n = 19). GDR was calculated at different time points and related to baseline cardiovascular risk factors and responses to a mental stress test (MST). The 60-, 90-, and 120-minute GDR correlated significantly with serum high-density lipoprotein (HDL) cholesterol (r=.59, r=.50, and r=.53, respectively), heart rate (HR) during MST (r = -.65, r = -.64, and r = -.58, respectively) and plasma epinephrine (Epi) (r = -.55, r= -.58, and r = -.56, respectively) and norepinephrine (NE) (r = -.52, r = -.49, and r = -.48, respectively) 1 minute after announcement of the MST (all P <.05). Although not statistically significant at all time points, similar relationships were observed between GDR and resting HR, systolic blood pressure (BP) at rest and during mental stress, body mass index (BMI), serum total cholesterol (Chol), serum triglycerides (TG), and blood hemoglobin (HgB), with remarkable consistency from about 40 to 50 minutes onwards. HDL cholesterol and Epi remained independent in stepwise multiple regression analyses with the 60-, 90-, and 120-minute GDR as dependent variables (all P <.05). We suggest that 60- to 90-minute glucose clamps may provide information about the relationship between insulin sensitivity and various cardiovascular risk factors in borderline hypertensive young caucasian men.
Reims
H M
HM
Department of Cardiology and Nephrology, Ullevaal University Hospital, Oslo, Norway.
Høieggen
A
A
Fossum
E
E
Rostrup
M
M
Eide
I
I
Kjeldsen
S E
SE
D000328:Adult; D001794:Blood Pressure; D002318:Cardiovascular Diseases / Q000209:etiology*; D002395:Catecholamines / Q000097:blood; D005947:Glucose / Q000378:metabolism*; D015309:Glucose Clamp Technique; D006339:Heart Rate; D006801:Humans; D006946:Hyperinsulinism / Q000503:physiopathology; D006973:Hypertension / Q000097:blood / Q000150:complications* / Q000378:metabolism; D008297:Male; D012044:Regression Analysis; D012307:Risk Factors; D013312:Stress, Physiological / Q000503:physiopathology; D013997:Time Factors
D002395:Catecholamines; D005947:Glucose