title: Effect of breathing an oxygen-helium mixture under positive pressure on biochemical parameters.
abstract: In 35 subjects the effect of breathing an oxygen-helium mixture or oxygen during 10 minutes under positive pressure of 40 hPa was studied. Immediately before positive-pressure breathing, in the last minute of this breathing, and 30 minutes after its and blood samples were taken for investigations. Positive-pressure breathing caused in both groups a rise-in the haematocrit value, total protein, albumin and glucose levels. The level of lactic acid rose during breathing oxygen by 74% and that of pyruvic acid increased by 44%, while during the use of the oxygen-helium mixture both these compounds failed to rise during positive-pressure breathing and 30 minutes after its completion.
mesh_terms: D000293:Adolescent; D000328:Adult; D001786:Blood Glucose / Q000032:analysis; D001798:Blood Proteins / Q000032:analysis; D004573:Electrolytes / Q000097:blood; D006371:Helium / Q000008:administration & dosage*; D006400:Hematocrit; D006801:Humans; D007770:L-Lactate Dehydrogenase / Q000097:blood; D007773:Lactates / Q000097:blood; D019344:Lactic Acid; D008297:Male; D010100:Oxygen / Q000008:administration & dosage*; D011175:Positive-Pressure Respiration; D011773:Pyruvates / Q000097:blood; D019289:Pyruvic Acid; D013268:Stimulation, Chemical
chemical_list: D001786:Blood Glucose; D001798:Blood Proteins; D004573:Electrolytes; D007773:Lactates; D011773:Pyruvates; D006371:Helium; D019344:Lactic Acid; D019289:Pyruvic Acid; D007770:L-Lactate Dehydrogenase; D010100:Oxygen