A physical activity program lasting at least 30 minutes each session was applied to HF patients in the intervention group, three days a week for three months. A pedometer was used to visualize the walking performed in the physical activity program and to record reliably. Weekly phone calls and monthly home visits were made to the patients in order to determine the continuation of the medical treatment and walking program used by the patients, to increase their motivation and to detect or intervene in any situation related to the walking program.

The individuals in the control group, were pre-tested, evaluated at the first, second, and third months, and followed up in the process without any intervention. Patients were reminded that they should continue their routine medical treatment and not start any physical activity program.

A physical activity program lasting at least 30 minutes each session was applied to HF patients in the intervention group, three days a week for three months. A pedometer was used to visualize the walking performed in the physical activity program and to record reliably. After the data obtained in the pre-test, the pedometers, which were calibrated and checked by the researchers, were delivered to the patients. At the end of each day of walking with pedometer monitoring, they were asked to record data such as the number of steps, walking hour, walking time, distance and complaints encountered during walking on the walking monitoring chart given to the patient by the researchers. Weekly phone calls and monthly home visits were made to the patients in order to determine the continuation of the medical treatment and walking program used by the patients, to increase their motivation and to detect or intervene in any situation related to the walking program.

Quality of life level were evaluated with the Minnesota Living with Heart Failure Questionnaire. Minnesota Living with Heart Failure Questionnaire was developed by Rector et al. to measure the quality of life in patients with heart failure. The total score of the scale, which has two sub-dimensions as "physical function" and "emotional", varies between 0 and 105. A low score indicates good quality of life, and a high score indicates poor quality of life.

Functional capacity level was evaluated with the International Physical Activity Questionnaire-Short Form and 6-Min Walking Test. International Physical Activity Questionnaire- Short Form developed by Craig et al. evaluates the duration of physical activity in the last seven days and the time spent sitting per day without moving. The energy required for each activity in the IPAQ is calculated with the metabolic equivalent-minute score according to the activity type or intensity. Functional capacity was evaluated with 6MWT according to the criteria of the "American Thoracic Society" guideline and the 6MWT distance reached at the end of the test was recorded in meters (m). In the study, the blood pressure of individuals was measured before and after 6MWT. Oxygen saturation and heart rate measurements were made and recorded with a portable pulse oximeter.

Mortality risk level was evaluated with Meta-Analysis Global Group in Chronic Heart Failure scores. To predict one- and three-year mortality in HF, with MAGGIC, Pocock et al. (2013) analyzed 30 cohort studies with a large number of patients, and they developed a risk scoring database based on HF risk factors. MAGGIC risk scoring results, provides a preliminary assessment in determining the one-year mortality in HF patients. In our study, the MAGGIC scores, which were obtained by taking the scores related to the initial and final follow-up, were compared. NT-proBNP serum concentration measurements, especially ventricular ischemic injury, have an important place in the prediction of mortality. In our study, serum NT-proBNP level was investigated to determine the diagnosis and prognosis of HF, to determine the functional capacity and the relationship between MAGGIC risk scoring and mortality risk.

There is a LVEF finding as an Echo finding made by the physician to be used in the MAGGIC scoring calculation. Considering that Echo evaluation may vary according to the physician's follow-up, it was ensured that the EF levels of the individuals were performed by the operator who performed the initial follow-up.