Abstract
The cardiovascular reaction to negative pressure breathing (NPB) was studied in human subjects in the condition of 15-hour head-down tilt (-15°). Amplitude and time characteristics of tidal oscillations of physiological parameters synchronous to free and NPB breathing were measured after 14 hours in HDT. Oscillations of cardiovascular parameters were determined using the coherent averaging technique. A multiple increase in amplitude was stated during transition from free breathing to NPB, whereas variations of the other characteristics of oscillations were little affected.
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