Document Detail

Hemodynamic profile of submaximal constant workload exercise in patients with heart failure secondary to ischemic or idiopathic dilated cardiomyopathy.
MedLine Citation:
PMID:  9485133     Owner:  NLM     Status:  MEDLINE    
Constant workload exercise on an upright bicycle at submaximal levels of exercise intensity is frequently used in physical training programs. Nevertheless, only a few data are currently available on the hemodynamic changes induced by constant workload exercise in patients with heart failure. The aim of this study was to assess the hemodynamic response during submaximal constant-workload exercise at 2 different work rates in patients with heart failure. The hemodynamic profile was assessed by means of right-sided cardiac catheterization in 21 men with moderate heart failure during submaximal-constant workload exercise performed on an upright bicycle for 15 minutes. The intensity of constant work rate exercise was selected during a previous symptom-limited or maximal test. The first submaximal test was performed at the level of the anaerobic threshold workload, corresponding to 64% of peak work rate, and the other test at 70% of anaerobic threshold workload (42% of peak work rate). During both submaximal tests, a marked increase in right heart pressure was observed as compared with baseline. The increase in systolic pulmonary artery pressure was statistically not different between the 2 tests (from 40 +/- 18 to 66 +/- 20 mm Hg during exercise at the anaerobic threshold workload, and from 39 +/- 16 to 63 +/- 21 mm Hg during exercise under anaerobic threshold). The increase in pulmonary arterial wedge pressure was similar (from 20 +/- 10 to 35 +/- 13 mm Hg during exercise at the anaerobic threshold, and from 19 +/- 9 to 32 +/- 12 mm Hg during the other test). Cardiac output and heart rate were significantly higher during submaximal exercise at a higher workload, paralleling the behavior of oxygen uptake. Finally, the hemodynamic profile during submaximal exercise at the anaerobic threshold workload was quite similar to that observed during symptom-limited exercise. Thus, in patients with heart failure, submaximal exercise performed at a constant workload, even at low exercise intensity, may determine relevant pressure changes in pulmonary circulation.
P Faggiano; A D'Aloia; A Gualeni; A Giordano
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Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  The American journal of cardiology     Volume:  81     ISSN:  0002-9149     ISO Abbreviation:  Am. J. Cardiol.     Publication Date:  1998 Feb 
Date Detail:
Created Date:  1998-03-04     Completed Date:  1998-03-04     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0207277     Medline TA:  Am J Cardiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  437-42     Citation Subset:  AIM; IM    
Division of Cardiology, S. Maugeri Foundation, IRCCS, Gussago, Italy.
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MeSH Terms
Anaerobic Threshold / physiology
Cardiomyopathy, Dilated / physiopathology*
Exercise / physiology*
Middle Aged

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