. Ciba Foundation colloquia on ageing. Old age; Aging; Animals -- growth & development. Respiratory Function and Age 63 or 30 breaths, equilibrium is esta])lislu'(l ])ctweon luno and spirometer, with a hehum percentage of 1) 12. 11" the luii^ had been perfectly eftieient from tlie point <»!' view of a ventilation enoineer—, if all the alveoli had been equally ventilated—it can be calculated that equilibrium should have been reached in 23 or 24 breaths, whereas in fact 30 breaths were required, and it is true that most normal individuals YOUNG NORMAL. 204060 ?o i5o% Fig. G. The
. Ciba Foundation colloquia on ageing. Old age; Aging; Animals -- growth & development. Respiratory Function and Age 63 or 30 breaths, equilibrium is esta])lislu'(l ])ctweon luno and spirometer, with a hehum percentage of 1) 12. 11" the luii^ had been perfectly eftieient from tlie point <»!' view of a ventilation enoineer—, if all the alveoli had been equally ventilated—it can be calculated that equilibrium should have been reached in 23 or 24 breaths, whereas in fact 30 breaths were required, and it is true that most normal individuals YOUNG NORMAL. 204060 ?o i5o% Fig. G. The efliciency of gas niixino in the hino, expressed as a percentage of perfect elliciency, is shown on the abscissa. operate at 70 or 80 per cent efficiency as far as ventilation is concerned. The record of a patient with emphysema is also shown in Fig. 5 and here the story is a very different one. Mixing was only complete after ten minutes or 150 breaths. In Fig. 6 is shown a summary of our results. Young normals operate at an average of 75 per cent efficiency while the figure for the older group is only 54 per cent, a difference which is statistically significant. This can only mean that with ad- vancing years ventilation of the lungs becomes more uneven, and this is presumably a sequel of loss of 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 Ciba Foundation; Wolstenholme, G. E. W. (Gordon Ethelbert Ward). Boston, Little, Brown
Size: 1795px × 1392px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookpublish, booksubjectaging, booksubjectoldage
