Intermittent Hypoxic-hyperoxic Training in Patients With Cardiovascular Pathology After COVID-19 Infection.

"IHHT will be carried out using the ReOxy normobaric hypoxic therapy apparatus (Bitmos GmbH, Germany, 26790/10221, 04/10/2019).~Each patient will undergo a hypoxic test to assess the individual response to hypoxia. The minimum safe SpO2 value is 82%, and the maximum allowable heart rate increase during exercise is + 50% of the starting value. When these parameters are reached, an automatic switch to the supply of a hyperoxic gas mixture (35-40% oxygen) occurs till the SpO2 level is 100%. During each training session a hypoxic gas mixture is supplied to the patient in an intermittent mode, alternating with the supply of a hyperoxic gas mixture. On average, each workout includes 6 of the above cycles. The total time of inhalation of a hypoxic gas mixture during one procedure is 20-30 minutes."

"IHHT will be carried out using the ReOxy normobaric hypoxic therapy apparatus (Bitmos GmbH, Germany, 26790/10221, 04/10/2019).~A control group of 30 patients will undergo a simulated IHHT course (with the same exposure time and number of sessions as intervention group - 15 sessions, 40-minutes long each, 5 workouts per week for 3 weeks). Patients of this group will breathe normoxic gas mixture (ordinary humidified air is supplied through the mask) during the entire session."