Aim: The aim of the study was to correlate the score derived from Specific Activity Questionnaire(SAQ), Left Ventricular Dysfunction 36(LVD 36)and the Minnesota Living with Heart Failure Questionnaire(LIhFE)with peak oxygen consumption me asured during maximal treadmill exercise spirometry in patients with heart failu re. Methods: We prospectively studied 106 patients, average age 47±15.5(mean±S D), with symptomatic heart failure. All were asked to answer the questions of th e above mentioned questionnaires. Subsequently patients underwent treadmill exer cise spirometry to measure peak oxygen consumption(VO2 peak ml/kg/min)using the Dargie protocol and to derive functional class according to the Weber classifica tion system. Results: SAQ had a very high performance in classifying patients wi th a VO2 peak< 20 ml/kg/min and those with a VO2 peak< 14 ml/kg/min. The correla tion between VO2 peak achieved and the METs corresponding to the score derived f rom SAQ according to the given answers was r=0.77(p< 0.01). The correlation betw een VO2 peak achieved and the score from LVD 36 was r=-0.74(p< 0.01). The corre lation between VO2 peak achieved and the score from LIhFE was r=-0.71(p< 0.01). Conclusion: The Specific Activity Questionnaire, the Left Ventricular Dysfuncti on and the Minnesota Living with Heart Failure Questionnaire were used to predic t aerobic capacity and all correlated significantly with peak VO2 achieved from exercise spirometry. The above questionnaires represent a useful method to acces s heart failure patients and are valuable for those unable to undergo a treadmil l test. Aim: The aim of the study was to correlate the score derived from Specific Activity Questionnaire (SAQ), Left Ventricular Dysfunction 36 (LVD 36) and the Minnesota Living with Heart Failure Questionnaire (LIhFE) with peak oxygen consumption as as during maximal treadmill exercise Methods: We prospectively studied 106 patients, average age 47 ± 15.5 (mean ± SD), with symptomatic heart failure. All were asked to answer the questions of th e above mentioned quesires. exer cise spirometry to measure peak oxygen consumption (VO2 peak ml / kg / min) using the Dargie protocol and to derive functional class according to the Weber classifica- tion system. Results: SAQ had a very high performance in classifying patients wi th a VO2 peak <20 ml / kg / min and those with a VO2 peak <14 ml / kg / min. The correction between VO2 peak achieved and the METs corresponding to the score derived fom SAQ according to the given an The correlativity between VO2 peak achieved and the score from LIh 36 was r = -0.74 (p <0.01). The correlativity between VO2 peak achieved and the score from LIhFE was r = -0.71 (p <0.01). Conclusion: The Specific Activity Questionnaire, the Left Ventricular Dysfuncti on and the Minnesota Living with Heart Failure Questionnaire were used to predic t aerobic capacity and all correlated significantly with peak VO2 achieved from exercise spirometry. represent a useful method to acces s heart failure patients and are valuable for those unable to undergo a treadmil l test.