49. SOME FACTORS AFFECTING RESPIRATORY DEAD SPACE: MAN (Concluded) 

 Part I: EFFECT OF BREATHHOLDING (Concluded) 

 Male subjects. Vjj = volume of dead space gas. 



/3/ Recording mass spectrometer method (Lilly nitrogen meter) 



Contributor : Rossier, P. H. 



References : [ l] Siebeck, R., Deut. Arch. klin. med. 102:390, 1911. [2] Fowler. W. S., Am. J. Physiol. 154:405, 

 1948. [3] Bartels, J., Severinghaus, J. W., Forster, R. E., Briscoe, W. A., and Bates, D. V., J. Clin. Invest. 

 33:41, 1954. 



Part II: EFFECT OF BREATHING LEVEL 



Each set of values is for a single subject. Unless otherwise indicated, measurements are by foreign gas (H^) 

 method. 



/I/ Alveolar CO2 tension method (Haldane- Priestley). /2/ Nitrogen method. 

 Contributors : (a) Rossier, P. H., (b) Severinghaus, J. W. 



References : [ l] Siebeck, R., Scand. Arch. Physiol. 25:91, 1911. [2] Henderson, Y., ChiUingworth, F. P., and 



J. L., Am. J. Physiol. 38:1, 1915. [3] Krogh, A., and Lindhard, J., J. Physiol. 51^:59, 1917. [4] Mundt. 

 and Schwarz, H., Pfliigers Arch. 244:107, 1941. [5] Fowler, W. S., Am. J. Physiol. 154:405. 



W. 



Whitney, 



E., Schoedel, 



1948. 



Part III: DEAD SPACE FOR O^. CO^, He, AND N^ 



Values are for single subjects at rest. All inspirations were 80% He- 20% O2 and followed a period of breathing air. 

 All breathholding times were about 2j sec. Recording mass spectrometer method (Lilly nitrogen meter). Ranges 

 in parentheses conform to estimate "b" of the 95% range (cf Introduction). 



Contributor : Rossier, P. H. 



Reference : Bartels, J., Severinghaus, J. W., Forster, R. E., Briscoe, W. A., and Bates, D. V., J. Clin. Invest. 

 33:41, 1954. 



49 



