REDUCED BAROMETRIC PRESSURE AND RESPIRATORY WATER LOSS
Rept. for 1 Apr-31 Oct 1964
GARRETT CORP LOS ANGELES CA AIRESEARCH MFG DIV
Pagination or Media Count:
Respiratory water loss was investigated with a group of normal subjects breathing oxygen orally. Data were collected from all subjects under three absolute pressures 3.5, 7.0, and 14.7 p.s.i., three work rates on a treadmill 0, 2, and 4 m.p.h., three humidities of the inspired oxygen 40F., 60F., and 80F. dewpoint, and three drybulb temperatures of the inspired oxygen 95F., 75F., and 55F.. The data were analyzed statistically. All of these variables affected respiratory water loss in varying degrees. Reduced pressure diminished respiratory water loss, apparently because of a corresponding decrease in minute volume observed at lower pressures. Increased work rates elevated pulmonary ventilation and thus increased respiratory water loss. Increasing humidity decreased water loss, while increasing drybulb temperature produced greater water loss. Expired gas temperatures approached body temperature only at elevated inspired temperature the expired gas volume was never saturated.
- Stress Physiology