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Exertional fatigue in patients with chronic heart failure is usually attributed to skeletal muscle underperfusion. Recently, skeletal muscle atrophy, abnormal muscle metabolic responses, and reduced muscle enzyme levels have been noted in such patients, raising the possibility that some patients may develop muscle fatigue due to intrinsic muscle abnormalities. The present study was undertaken to determine if a subpopulation of patients with heart failure develops exertional fatigue due to skeletal muscle dysfunction rather than to reduced muscle flow.

Exertional fatigue due to skeletal muscle dysfunction in patients with heart failure.