[Informative value of rerespiration as a method for evaluating functional reserves of the cardiorespiratory system in modeling of some flight factors].

This article presents a study of the informative value of the recurrent breathing (rerespiration) method developed by the authors, for evaluating the functional status of the human body during recovery after exposure to noise and vibration, to piloting accelerations and head-down hypokinesis. It is shown that a 1.5-h exposure to noise and vibration increases tolerance to rerespiration, suggesting a stimulatory effect. A 5-h exposure in half of cases either does not change tolerance to the test or lowers it. Piloting head-to-seat accelerations of 7 to 9 G are associated with a lowering in tolerance to rerespiration, the functional status being recovered 1 d later. A similar exposure to 3-5 G in 83% of cases is not associated with an alteration of response to the test. After a 30-day head-down hypokinesis there is a lowering of tolerance to rerespiration, both in subjects with drug correction and in the control group. On day 10 of recovery in the control group return to the baseline rerespiration tolerance level was incomplete. Medically treated subjects demonstrated a complete recovery. Thus, rerespiration in the developed methodological version, is an informative loading test allowing to evaluate the dynamics of the functional status of the body. As a signal method it helps to clarify the individual duration of recovery after performing flight-related tasks, to substantiate the necessity of rehabilitation procedures and assess their effectiveness, as well as to detect persons with a stable decline of tolerance to rerespiration.