Changes of pulmonary function in humans during exposure to +Gx acceleration after simulated and real microgravity

An important goal of space medicine is preserving high tolerance and performance of cosmonauts an ring exposure to acceleration at the final flight stage given varying mission duration. Among physiological mechanisms limiting +Gx acceleration tolerance, an important role is played by disturbances of external respiration resulting from alterations of respiratory biomechanics, pulmonary gas exchange conditions, and arterial hypoxemia. However, at present data on external respiration changes during exposure to +Gx acceleration after simulated and real microgravity of varying duration, are extremely scanty.