Does the autonomic nervous system play a role in the development of insulin resistance? A study on heart rate variability in first-degree relatives of Type 2 diabetes patients and control subjects

Diabet Med. 2003 May;20(5):399-405. doi: 10.1046/j.1464-5491.2003.00920.x.

Abstract

Aims: To investigate dysregulation of the autonomic nervous system as a potential mechanism for early insulin resistance in the development of Type 2 diabetes.

Methods: Thirteen healthy individuals with first-degree relatives with Type 2 diabetes (R) were compared with 14 control subjects without family history of diabetes (C), matched for age, body mass index and sex. An oral glucose tolerance test and a hyperinsulinaemic euglycaemic clamp were performed. Analysis of heart rate variability during rest, controlled breathing, an orthostatic manoeuvre and a standardized physical stress (cold pressor test (CPT)), were used to evaluate the activity of the autonomic nervous system.

Results: Fasting blood glucose, HbA1c and serum insulin were similar in the R and C groups. The M-value, reflecting insulin sensitivity, did not differ significantly between the groups. Total spectral power and high-frequency power were lower in R during controlled breathing (P = 0.05 and P = 0.07, respectively), otherwise there were no significant differences between R and C in heart rate variability. However, low-frequency (LF)/high-frequency (HF) spectral power ratio during CPT, reflecting sympathetic/parasympathetic balance, was negatively associated with insulin sensitivity (r = -0.53, P = 0.006). When all subjects were divided into two groups by the mean M-value, the low M-value group displayed an overall higher LF/HF ratio (P = 0.04). HF power was lower in the low M-value group during controlled breathing and CPT (P = 0.01 and P = 0.03, respectively).

Conclusion: An altered balance of the parasympathetic and sympathetic nervous activity, mainly explained by an attenuated parasympathetic activity, might contribute to the development of insulin resistance and Type 2 diabetes.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Arrhythmias, Cardiac / etiology
  • Arrhythmias, Cardiac / genetics
  • Autonomic Nervous System Diseases / blood
  • Autonomic Nervous System Diseases / complications*
  • Autonomic Nervous System Diseases / physiopathology
  • Blood Glucose / analysis
  • Body Mass Index
  • Body Weight
  • Diabetes Mellitus, Type 2 / genetics
  • Diabetes Mellitus, Type 2 / physiopathology*
  • Female
  • Glucose Clamp Technique / methods
  • Glucose Tolerance Test / methods
  • Glycated Hemoglobin A / analysis
  • Humans
  • Insulin Resistance*
  • Male
  • Pedigree

Substances

  • Blood Glucose
  • Glycated Hemoglobin A