Physical training alters the pathogenesis of pacing-induced heart failure through endothelium-mediated mechanisms in awake dogs

Jie Wang, Geng Hua Yi, Mathias Knecht, Bo Lin Cai, Sulli Poposkis, Milton Packer, Daniel Burkhoff

Research output: Contribution to journalArticle

48 Scopus citations

Abstract

Background: Beneficial effects of exercise training on cardiovascular function in chronic heart failure (CHF) have been suggested previously but the underlying mechanisms are unknown. We tested whether daily exercise training improves systemic hemodynamics and preserves endothelium-mediated vasodilator function during development of heart failure. Methods and Results: Fifteen dogs were surgically instrumented for hemodynamic measurements. One group of dogs underwent 4 weeks of cardiac pacing (210 bpm for 3 weeks and 240 bpm during week 4), and another group underwent pacing plus daily exercise training (4.4±0.3 km/h, 2 h/d). Pacing-alone dogs developed CHF characterized by typical hemodynamic abnormalities, blunted endothelium-mediated vasodilator function in coronary and femoral circulations, and decreased gene expression of endothelial constitutive nitric oxide synthase (ECNOS, normalized to GAPDH expression; normal, 1.15±0.31 versus CHF, 0.29±0.08, P<.05). Exercise training preserved normal hemodynamics at rest, endothelium-mediated vasodilator function, and gene expression of ECNOS (0.72±0.16 versus normal, P=NS). Inhibition of NO synthesis (nitro-L-arginine) in exercise-trained dogs abolished the preserved endothelium-mediated vasodilation of epicardial coronary arteries and elevated left ventricular end-diastolic pressure (7.7±0.3 to 19±3.4 mm Hg, P<.05), suggesting that the preservation of resting hemodynamics was in large part due to preserved endothelial function concealing the underlying CHF state. Conclusions: Long-term exercise training altered the natural history of heart failure due to rapid cardiac pacing. One of the underlying mechanisms is through the preservation of endothelial vasodilator function.

Original languageEnglish (US)
Pages (from-to)2683-2692
Number of pages10
JournalCirculation
Volume96
Issue number8
DOIs
StatePublished - Oct 21 1997

Keywords

  • Circulation
  • Endothelium-derived factors
  • Exercise
  • Heart failure

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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