深呼吸時ニ於ケル肺胞空氣ノ組成ニ就テ
1940 年 52 巻 9 号 p. 2188-2191
詳細
1940 年 52 巻 9 号 p. 2188-2191
After Haldane's method of sampling the alveolar air we took one sharp and forced expiration through a piece of hose-pipe about 105cm long and 2.5cm in diameter, after 2, 5, 10, 15 and 30 times forced breathings each of which was done once per 2 seconds. Then, at once, the last part of this expired air was collected into a vacuous sampling tube introduced air-tight through a hole at the wall of the hose-pipe near the mouth piece, and analysed by means of Haldane's gas analysis apparatus.
Conclusion: 1) The CO2-pressure in normal resting alveolar air, taken by the original method in a sitting position is 40.4mm-43.5mm of Hg, and the O2-pressure in it is 96.5mm-108.2mm of Hg.
2) After 2 times forced breathings, the CO2-pressure in alveolar air is remarkably diminished, that is, to 27.1mm-28.7mm of Hg, and the O2-pressure raised to 128.7mm-131.0mm of Hg.
More than these 2 times forced breathings did not cause a noticeable change on the CO2- and O2-pressures in alveolar air.
