RESPIRATORY SINUS ARRHYTHMIA (RSA): NONINVASIVE MEASURE OF PARASYMPATHETIC CARDIAC CONTROL IN NEWLY DIAGNOSED HYPERTENSIVES AND THE INFLUENCE OF ABDOMINAL BREATHING. J. V. N. Karazin Khark. Nat. Univ., Ser. Med. 2015;(3):80-85. дата звернення Жовтень 25, 2026. https://periodicals.karazin.ua/medicine/article/view/7382