[Human histamine and serotonin levels during neuro-emotional stress]

Levels of histamine and serotonin in blood of test subjects kept on a Salyut space diet were measured during their simulated rise to an altitude of 8,000 m, anticipation of an exposure to acceleration, and mental work. During simulated rise the level of histamine increased and histaminopectic activity of serum decreased. During anticipation of centrifugation the serotonin concentration grew. Levels of histamine and serotonin did not vary significantly in the test subjects kept on the space diet with certain food supplements.