Test subjects were exposed to 13-day water immersion per se or combined with centrifugation. The immersion did not influence the state of ventilation and gas exchange at rest, diminished significantly the functional capabilities of external respiration. An exposure of the test subjects to acceleration during the second half of water immersion resulted in the normalization of the functional reserves of external respiration. This may be a consequence of an increase in the total physical tone of the body.
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