Features of functional relationship between the respiratory system and the circulatory system in respiration with additional resistance

Timing, speed and volume parameters of respiration and circulation of standing young man were recorded in respiratory with inspiration or expiratory additional resistance synchronously. Increased respiratory variations in intrathoracic pressure are accompanied by fluctuations of systolic volume. The heart rate changes in accordance with the changes of systolic volume. Thus, the optimal for these conditions cardiac output is provided at any given moment. The main parameters of the respiratory cycle, affecting hemodynamics, are the depth, speed of inhalation and exhalation of thoracic and abdominal components.