Purpose: There is a paucity of research regarding the relationship between upper extremity function and exercise tolerance in patients with heart failure (HF). This study aimed to perform arm and treadmill exercise testing and to compare responses to the tests in patients with HF. Material and methods: Twenty-five patients with heart failure participated in the study. All patients underwent two maximal symptom-limited exercise tests with gas exchange analysis on treadmill and arm ergometer. Results: At peak exercise level, heart rate, systolic and diastolic blood pressures, rate-pressure product, peak oxygen consumption, and peak exercise duration were significantly higher during treadmill than during arm ergometry testing (p<0.05). Respiratory exchange ratio at peak exercise was higher during the arm exercise test compared to the treadmill test (p<0.05). Conclusion: Exercise capacity of the arms is lower than the exercise capacity of the legs in patients with HF. There is need for future researche carried out with larger samples, to compare the different exercise testing modalities in HF.