Aim. The purpose of the study is to conduct a comparative analysis of the effectiveness of physical aerobic training in the mode of interval and constant loads in patients who have had a myocardial infarction with subsequent percutaneous coronary intervention. Materials and methods. 35 patients aged from 46 to 67 years old were examined in the process of passing a 3-week course of physical rehabilitation in a day hospital. Of these, 18 people (group 1) performed daily training on cardiovascular machines in the mode of interval loads, 17 people (group 2) - in the mode of moderate loads with constant intensity. Results. When conducting physical training in different training regimens, both groups of patients showed an improvement in exercise tolerance. At the same time, the interval training as compared to the constant intensity training provided a more pronounced training effect on the cardiorespiratory system due to high-intensity loading phases and at the same time a low level of hemodynamic load due to the presence of relatively low-intensity phases. Conclusion. Interval training is preferred in patients who have had a myocardial infarction followed by percutaneous coronary intervention, due to their high efficacy and safety.

Background.Even though the six-minute walking test is a simple and widely available tool for the evaluation of the functional capacity of cardiac patients, its interpretation is associated with some difficulties and contradictions.Aims:To evaluate the dynamics of tolerance to physical activity during outpatient rehabilitation of patients with ischemic heart disease using predicted values of distance in the six-minute walking test.Materials and methods.97 patients (70 men and 27 women, average age 59.6 [50; 60] years) after acute coronary syndrome and after myocardial revascularization were included. The six-minute walking test was performed at the beginning of the 3-weeks stage of cardiac rehabilitation and before the patients discharge. The results of the test were reported as an absolute value, a change in absolute value, and the percentage of predicted values, estimated with the reference equation by Enright and colleagues.Results.The absolute value of distance in the six-minute walking test was increased significantly from 418 [385; 465] m to 485 [440; 525] m (p0.001). The number of patients with a distance less than 300 m was decreased significantly (12 patients, 12% vs 2 patients, 2%,p0.001). In most patients, the absolute increase in distance was 30 m and more (81 people, 84%). After comparing the perceived data with the calculated predicted values, it was revealed that the distance raised from 79 [71; 82]% to 92 [88; 96]% of the predicted values. And 56 patients (58%) had a distance equal to 90% or more from its predicted value.Conclusions.During the third stage of cardiac rehabilitation the significant increase of the absolute value of the six-minute walking test, the growth of the percentage of predicted values, and the decrease of patients with a distance less than 300 m were found. All these estimation methods may be used to demonstrate and prove favourable changes of tolerance to physical activity in patients with ischemic heart disease.