Effects of Low Oxygen Inhalation on Values of Electric Flicker

By means of Motokawa's method of electric flicker, we measured variations of electric flicker values (EFV) of 7 subjects during and after 10% O2 inhalation. Measurements by an ear oximeter were carried out in parallel. During 3 minutes' inhalation of 10% O2 EFVs increased, but oximeter values (Oxi-V) decreased, the change in EFVs being more prompt. Recovery occurred with similar time-courses in both phenomena. In severe exercise both kinds of values changed similarly to the insufficient oxygen supply caused above. Administration of pure oxygen during exercise reduced the changes only temporarily. The authors have pleasure in acknowledging their indebtedness to Prof. Motokawa who has guided them kindly.