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We recently found that resting muscle sympathetic nerve activity is inversely related to peak oxygen uptake (VO(2) peak) in patients with heart failure, suggesting a peripheral neurogenic limit to exercise in heart failure. No such relationship was observed in healthy controls. To determine whether this observation is specific to sympathetic discharge to skeletal muscle, we tested the null hypothesis that VO(2) peak would not relate to resting cardiac noradrenaline spillover, which is also elevated in heart failure.

Peak oxygen uptake is not determined by cardiac noradrenaline spillover in heart failure