By means of Motokawa's method of electric flicker (EF), we measured variations of electric flicker values (EFV) of 5 subjects caused by hyperpnea, the inhaled gases being air, 100% O
2 and 1% CO
2 in
2. Measurements by an ear oximeter were carried out in parallel.
1. During 5 minutes' deep breathing of air, both EFV and oximeter values (Oxi-V) increased.
2. Also by deep breathing of pure oxygen, both kinds of values increased.
3. In case of 100% O
2 inhalation (normal breathing), Oxi-V increased, but no change occurred in EFV.
4. In case of hyperpnea of 1% CO
2 in O
2, Oxi-V increased, while no change could be found in EFV.
From these findings it was concluded that the change in EFV by hyperpnea is due to acapnia.
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