Normal Variations in End-Tidal Air and Arterial Blood Carbon Dioxide and Oxygen Tensions During Moderate Exercise

Alveolar and Arterial Oxygen Tensions and the Significance of the Alveolar-Arterial Oxygen Tension Difference in Normal Men 1

“…Hg higher than that of arterial blood simultaneously sampled. That the difference observed by other investigators (18) and by us is so much less than that reported by Riley is obviously in a large measure accounted for by the methods used to obtain the "alveolar" sample. The theoretical analysis by Dubois (21) of the probable cyclic changes in alveolar Pco2 emphasizes tb'± necessity for cir- If the diffusion theory of alveolar gas exchange is accepted, the Pco2 of gas to which pulmonary blood is exposed cannot be higher than the Pco2 of blood flowing from the alveolar capillaries.…”

“…Riley, Lilienthal, Proemmel, and Franke (11) using the Boothby modification of the HaldanePriestley technique and other investigators (18) using an "end tidal" sampling device (19) found that the Pco2 of directly sampled alveolar gas averaged 12.7 and 1.8 mm. Hg higher than the Pco2 of simultaneously sampled arterial blood in normal subjects during exercise.…”

The Physiological Meaning of the Maximal Oxygen Intake Test1

“…In contrast, a decrease in arterial oxygen tension during low grades of exercise has been reported by other observers (26)(27)(28) (30) felt that the phenomenon might be due to pH changes and not to a decrease in ar-terial oxygen tension. Our results support the latter view (Figure 2).…”

Altersabhängigkeit des alveolo-arteriellen O₂-Partialdruckgradienten bei Schwerarbeit in Normoxie, Hypoxie und Hyperoxie

“…Zudem sind die R esu ltate anderer A utoren je n ach M ethode, K örperstellung, V ersuchsanordnung und M eereshöhe re ch t verschieden. Die m eisten A utoren sind sich d arü b er einig, daß bei jungen V ersuchspersonen der 0 2-P artiald ru ck im arteriellen B lut u n ter B elastung etw as ab sin k t: L il ie n t h a l et al [16], S ü s k in d et al [29], F il l e y et al [9], U lm er und R e ic h e l [31]; ein Anstieg ist einzig von Galdston und W olla ck [11] sowie B a r t e l s et al [3] gesehen w orden. Einen leichten R ückgang der arteriellen 0 2-S pannung bei m ittelschw erer B elastung und einen W iederanstieg bei Schw erarbeit h a t Sc h e r r e r [26] beschrieben.…”