Peak Oxygen Consumption and Heart Failure Prognosis—Does Race, Sex, or Fat Explain the Discrepancy? : Editor’s note: The following commentary addresses issues raised in an article published in the previous issue. Arena R, Myers J, Abella J, et al. Prognostic characteristics of cardiopulmonary exercise testing in Caucasian and African American patients with heart failure. Cong Heart Fail. 2008;14:310-315. We urge the readership to review the points raised in both articles.