Evaluation of the Six Minute Walk Test and Other Instruments in Heart Failure

Inclusion Criteria: * Both sexes * Different etiologies of Heart Failure * Functional class I - III (NYHA) * Left ventricular ejection fraction (LVEF) ≤ 50% * No history of previous cardiac surgery * In return for medical evaluation at the Amelio Marques Clinic, Hospital de Clinicas, Federal University of Uberlândia scheduled for the period from October 2012 to January 2013 * Clinical stability observed by: heart rate, respiratory rate, blood pressure and arterial oxygen saturation Exclusion Criteria: * Bad cognition compromising the understanding of tests * Physical disability that compromise the performance in walk test * Aortic aneurysm or any aortic deformity * Patients with signs or symptoms of transient myocardial ischemia with angina pectoris and/or class IV by the Canadian Cardiovascular Society Classification * Anomalous pressure behavior with hypertension \> 180/100 mmHg * Orthostatic hypotension (decrease \> 15 mmHg ) with symptoms * Arrhythmia with presence of complex ventricular extra systoles * Tachycardia sinus at rest (HR \> 120 beats/min) * Atrioventricular block of 2nd or 3rd degree * Subjects with pacemakers or implantable cardioverter-defibrillator (ICD) * Functional class IV by the New York Heart Association * Chronic organ dysfunction such as renal failure, respiratory or liver disease * Active neoplasia over the past five years * Commitment as general weakness, fever, other limiting factors (psychological, musculoskeletal) * Feeling sick before the b…