Accession Number : AD0749028

Title :   Pulmonary Mechanical Functions in Man Breathing Dense Gas Mixtures at Great Depths.

Descriptive Note : Preliminary summary rept.,

Corporate Author : NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C

Personal Author(s) : Wright,W. Brandon ; Peterson,R. ; Lambertsen,C. J.

Report Date : JUL 1972

Pagination or Media Count : 15

Abstract : The high density of breathing gas at great depths may impair a diver's performance by mechanical overload of his respiratory system. In order to describe this phenomenon and to search for a respiratory limit to deep diving pulmonary mechanical functions were measured at 19 different breathing gas densities ranging from 0.4 to 25 gms/L. (equivalent to helium at sea level to helium at 150 Ata). The results of these studies showed that function at rest is not severely affected by the great density increase. Respiratory limits to forced or exercising ventilation do appear, but useful function persists even to the maximum density studied and can be predicted to persist to even much greater densities. (Author)

Descriptors :   (*PRESSURE BREATHING, *DIVING), LUNG, RESPIRATION, STRESS(PHYSIOLOGY), HIGH PRESSURE, EXERCISE(PHYSIOLOGY)

Subject Categories : Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE