. The comparative physiology of respiratory mechanisms. Respiration. RESPIRATION IN AIR 67 ures accurately the amount of work, a linear relationship as shown in Fig. 39 is found between the rate of work and the metabolism as measured by the oxygen uptake. One set of results, marked •, were obtained on an ordinary bicycle ergometer on which the subject must keep himself fixed by. 360 720 mo IW0 Fig. 39. Relation between oxygen absorption in liters per minute and rate of work in kgm per min. in a human subject. (M. Nielsen.) gripping the handle bars, while the others were obtained with the subje
. The comparative physiology of respiratory mechanisms. Respiration. RESPIRATION IN AIR 67 ures accurately the amount of work, a linear relationship as shown in Fig. 39 is found between the rate of work and the metabolism as measured by the oxygen uptake. One set of results, marked •, were obtained on an ordinary bicycle ergometer on which the subject must keep himself fixed by. 360 720 mo IW0 Fig. 39. Relation between oxygen absorption in liters per minute and rate of work in kgm per min. in a human subject. (M. Nielsen.) gripping the handle bars, while the others were obtained with the subject working the ergometer in a reclining position in an easy chair. In spite of this difference the results are identical. The maximum 02 uptake in a trained athlete is between 4 and 5 1/min. From determinations of the diffusion of carbon monoxide from the alveolar air into the blood of human sub- jects, Bpje (1936) calculates a maximum 02 uptake of 1/min. Special experiments (M. Nielsen and O. Hansen, 1937) with breathing of oxygen-enriched air show, however, that the diffusion rate of oxygen into the blood is not the limiting factor for the O2 absorption. There is reason to suspect that the results of diffusion determinations are sys- tematically too low (Hartridge and Roughton, 1927).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Krogh, August, 1874-1949. Philadelphia, University of Pennsylvania press
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