Diabetes Care, Vol 23, Issue 5 624-628, Copyright © 2000 by American Diabetes Association

ARTICLES

Heart rate in relation to insulin sensitivity and insulin secretion in nondiabetic subjects

A Festa, R D'Agostino, CN Hales, L Mykkanen and SM Haffner
Department of Medicine, University of Texas Health Science Center, San Antonio, USA.

OBJECTIVE: Elevated heart rate has been predictive of cardiovascular disease and has been proposed as a global index of the autonomic nervous system influence on the heart. Hyperinsulinism has been shown to trigger sympathetic activity experimentally; however, the clinical and epidemiological data on the association of heart rate with hyperinsulinism and insulin resistance are conflicting. RESEARCH DESIGN AND METHODS: Insulin sensitivity (S(I)) and the acute insulin response (AIR) to glucose were assessed by a frequently sampled intravenous glucose tolerance test and related to resting heart rate in the tri-ethnic nondiabetic population (n = 1,000) of the Insulin Resistance Atherosclerosis Study. RESULTS: Heart rate was related to fasting insulin (r = 0.20), intact proinsulin (r = 0.15), split proinsulin (r = 0.17), and AIR (r = 0.18), and an inverse relation was found between heart rate and S(I) (r = -0.19) (all P values <0.0001, adjusted for age, sex, ethnicity, glucose tolerance status, and smoking). In a multiple linear regression analysis (adjusting for age, sex, ethnicity, clinical center, glucose tolerance status, and smoking), heart rate was significantly and independently associated with AIR, proinsulin, and S(I). CONCLUSIONS: Proinsulin, acute insulin secretion, and S(I) are associated with heart rate in nondiabetic subjects.
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