111. 



EFFECT OF REDUCED BAROMETRIC PRESSURES ON PULMONARY 

 FUNCTION AND HEART RATE: MAN (Concluded) 



III As calculated by equation from Fenn, W. O., Rahn. H., and Otis, A. B., Am. J. Physiol. J_46:639, 1946. 

 IZl Calculated at BTPS. /3/ Per cent saturation of arterial blood as estimated from alveolar pCO^ and pO^ with the 

 nomogram of L. J. Henderson, 1928. /4/ Per cent saturation of arterial blood as indicated by the Millikan oximeter. 



VaxpC 



/5/ At STP; calculated from O2 consumption 



0.864 X Q' 



where Va =alveolar ventilation in L/min. BTPS; pC =alveo- 



310 760 . _, ^ , ,,„ 



A constant dead space of 210 cc was 



lar pCO^ in mm Hg; Q = alveolar respiratory quotient; 0.864 = — j x 



assumed in computing Va from total ventilation (150 cc personal dead space, plus 60 cc apparatus dead space). 

 Ibl As per cent of resting heart rate at ground level. These values are averages based on several measurements 

 during each indicated lO-min period. /7/ Average value for control rate in beats/min. 



Contributors : (a) Ivy, A. C, (b) Marbarger, J. P., (c) Swann. H. G., (d) Wechsberg, P. 



Reference : Air Force Tech. Rept. No. 6528, Aug. 1951. 



153 



