Cardiac lipid content is unresponsive to a physical activity training intervention in type 2 diabetic patients, despite improved ejection fraction

Cardiovasc Diabetol. 2011 May 26:10:47. doi: 10.1186/1475-2840-10-47.

Abstract

Background: Increased cardiac lipid content has been associated with diabetic cardiomyopathy. We recently showed that cardiac lipid content is reduced after 12 weeks of physical activity training in healthy overweight subjects. The beneficial effect of exercise training on cardiovascular risk is well established and the decrease in cardiac lipid content with exercise training in healthy overweight subjects was accompanied by improved ejection fraction. It is yet unclear whether diabetic patients respond similarly to physical activity training and whether a lowered lipid content in the heart is necessary for improvements in cardiac function. Here, we investigated whether exercise training is able to lower cardiac lipid content and improve cardiac function in type 2 diabetic patients.

Methods: Eleven overweight-to-obese male patients with type 2 diabetes mellitus (age: 58.4 ± 0.9 years, BMI: 29.9 ± 0.01 kg/m2) followed a 12-week training program (combination endurance/strength training, three sessions/week). Before and after training, maximal whole body oxygen uptake (VO2max) and insulin sensitivity (by hyperinsulinemic, euglycemic clamp) was determined. Systolic function was determined under resting conditions by CINE-MRI and cardiac lipid content in the septum of the heart by Proton Magnetic Resonance Spectroscopy.

Results: VO2max increased (from 27.1 ± 1.5 to 30.1 ± 1.6 ml/min/kg, p = 0.001) and insulin sensitivity improved upon training (insulin stimulated glucose disposal (delta Rd of glucose) improved from 5.8 ± 1.9 to 10.3 ± 2.0 μmol/kg/min, p = 0.02. Left-ventricular ejection fraction improved after training (from 50.5 ± 2.0 to 55.6 ± 1.5%, p = 0.01) as well as cardiac index and cardiac output. Unexpectedly, cardiac lipid content in the septum remained unchanged (from 0.80 ± 0.22% to 0.95 ± 0.21%, p = 0.15).

Conclusions: Twelve weeks of progressive endurance/strength training was effective in improving VO2max, insulin sensitivity and cardiac function in patients with type 2 diabetes mellitus. However, cardiac lipid content remained unchanged. These data suggest that a decrease in cardiac lipid content in type 2 diabetic patients is not a prerequisite for improvements in cardiac function.

Trial registration: ISRCTN: ISRCTN43780395.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adiposity
  • Body Weight
  • Diabetes Mellitus, Type 2 / metabolism
  • Diabetes Mellitus, Type 2 / physiopathology
  • Diabetes Mellitus, Type 2 / therapy*
  • Diabetic Cardiomyopathies / metabolism
  • Diabetic Cardiomyopathies / physiopathology
  • Diabetic Cardiomyopathies / therapy*
  • Glucose Clamp Technique
  • Humans
  • Insulin Resistance
  • Lipid Metabolism*
  • Magnetic Resonance Imaging, Cine
  • Magnetic Resonance Spectroscopy
  • Male
  • Middle Aged
  • Myocardium / metabolism*
  • Netherlands
  • Overweight / metabolism
  • Overweight / physiopathology
  • Overweight / therapy*
  • Oxygen Consumption
  • Recovery of Function
  • Resistance Training*
  • Stroke Volume*
  • Time Factors
  • Treatment Outcome
  • Ventricular Function, Left*

Associated data

  • ISRCTN/ISRCTN43780395