Functional dilator capacity is independently associated with insulin sensitivity and age in central obesity and is not improved by high dose statin treatment.

Abstract

OBJECTIVE:

To test the hypothesis that: (i) functional microvascular dilator capacity is independently associated with insulin sensitivity and age in individuals with central adiposity at risk of cardiovascular disease (CVD); and (ii) functional microvascular dilator capacity is improved by high dose statin treatment.

METHODS:

Functional dilator capacity (measured as change in laser Doppler blood flux from baseline during post occlusive reactive hyperemia [peak flux%resting flux; PF%RF] and flowmotion (power spectral density [PSD] analysis)) were assessed in 40 people with central adiposity and one or more other CVD risk factors. Measurements were made at rest and during acute hyperinsulinaemia before and six months after high dose atorvastatin (40 mg daily) or placebo.

RESULTS:

Insulin-induced change in PF%RF was independently associated with insulin sensitivity (M/I) (r = 0.46 p = 0.02) and age (r = -0.46 p = 0.02), which together explained almost half of the variance in PF%RF (adjusted r² = 0.37, p = 0.008). Whilst atorvastatin decreased LDL cholesterol by 51% (p < 0.001), PF%RF and flowmotion remained unchanged.

CONCLUSIONS:

Insulin sensitivity and age are independently associated with an insulin-induced change in functional microvascular dilator capacity in individuals with central adiposity at risk of CVD. Dilator capacity is not improved by six months high dose statin treatment.

• Authors: Geraldine F Clough, Veline L'Esperance, Magdalena Turzyniecka, Lara Walter, Andrew J Chipperfield, John Gamble, Andrew J Krentz, Christopher D Byrne
• Journal: Microcirculation (New York, N.Y. : 1994) (Microcirculation) Vol. 18 Issue 1 Pg. 74-84 (Jan 2011) ISSN: 1549-8719 [Electronic] United States
• PMID: 21166928 (Publication Type: Clinical Trial, Journal Article, Randomized Controlled Trial, Research Support, Non-U.S. Gov't)
• Copyright: © 2010 John Wiley & Sons Ltd.

Chemical References

• Anticholesteremic Agents
• Heptanoic Acids
• Pyrroles
• Atorvastatin

Topics

• Acute Disease
• Adult
• Aged
• Anticholesteremic Agents (administration & dosage)
• Atorvastatin
• Blood Flow Velocity (drug effects)
• Female
• Heptanoic Acids (administration & dosage)
• Humans
• Hyperemia (drug therapy, physiopathology)
• Hyperinsulinism (drug therapy, physiopathology)
• Insulin Resistance
• Male
• Microcirculation (drug effects)
• Middle Aged
• Obesity, Abdominal (drug therapy, physiopathology)
• Pyrroles (administration & dosage)
• Risk Factors
• Vasodilation (drug effects)