QUANTITATIVE EFFECTS OF ABRUPT DECELERATION ON PULMONARY DIFFUSION IN MAN.
Rept. for 1 Sep 65-1 Feb 66,
AEROMEDICAL RESEARCH LAB (6571ST) HOLLOMAN AFB N MEX
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Pulmonary diffusion capacity was measured in nine subjects using the steady state method to determine if this physiological measurement was altered by impact. Each subject rode the Daisy Decelerator twice backward G sub x at 25 G, twice laterally -G sub y at 15 G, and experienced one sham ride. Carbon monoxide diffusion capacities were measured immediately before and after each ride, and 3 and 24 hours afterward. No significant change in pulmonary diffusion capacity was associated with impact. There was no correlation between observed and predicted CO diffusion capacity based on oxygen consumption, however, observed CO diffusion capacity and oxygen consumption were highly correlated. The validity of the prediction formula as described by Donevan et al. is questioned, but this may be related to the increased altitude 4400 ft at which the studies were done. Author
- Stress Physiology