1. BelalS.А.S., Kulik A.L., Martynenko A.V., Yabluchanskiy M.I. BIOFEEDBACK QUALITY IN THE LOOP OF PACED BREATHING AND HEART RATE VARIABILITY PARAMETERS IN HEALTHY VOLUNTEERS OF DIFFERENT RACE // The Journal of V. N. Karazin Kharkiv National University, series "Medicine". 1. № 24. C. 13-17.