© 2008 European Society of Cardiology
Is exercise efficiency really impaired in heart failure patients?
Cardiac Metabolism Research Group, Department of Physiology, Anatomy and Genetics, University of Oxford Parks Road, Oxford OX1 3PT, UK E-mail address: lindsay.edwards@dpag.ox.ac.uk. Tel.: +44 1865 282 253.
Department of Sports Studies, University of Winchester Winchester, UK
School of Clinical Science, Faculty of Medicine, University of Liverpool Liverpool, UK
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Witte et al. [1] recently reported reduced exercise efficiency in patients with chronic heart failure. Theoretically, this could occur because of mitochondrial uncoupling [2] or increased cost at any point downstream of the mitochondrion. However, we question their interpretation.
In an individual, metabolic