Accession Number:

ADA214991

Title:

The Characteristics of Physiological Responses and Tolerance Evaluation of Pressure Breathing

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH

Report Date:

1989-10-12

Pagination or Media Count:

18.0

Abstract:

Experiments were performed on 6 young healthy males during pressure breathing without trunk counter-pressure. The values of intra-pulmonary pressure used were 0,2.0, 3.0, 3.4, 4.0, 4.4 and 5.4 kPa. The results were summarized as follows. With the increase of pressure within the lung, the compensatory functions of circulatory and respiratory power consumption index was increased, but it was dropped as the intra-pulmonary pressure reached 4.0 kPa. The decrease of above objective physiological indices showed that the compensatory function was weakened, which was the indication of physiological endurance limit during pressure breathing. There was a serious subjective symptom for the breathing to be continued difficulty experimental examples discontinued only, that maybe considered as the acceptable endurance index. The respiratory power consumption index can reflect respirodynamically physiological characteristics of subjective sensation in human during pressure breathing which may be used as a co-indicator for the evaluation of the tolerance of pressure breathing was presented through the experiment. The intra-pulmonary pressure of 2.0, 3.4, and from 4.0 to 6.2 KPa was considered to be the physiological limit of safety, allowance and endurance. This study denoted marked significance for establishing physiological standard and protective measure of pressure breathing by oxygen. Keywords Pressure breathing, Physiological limit, Intra-pulmonary pressure, Foreign technology, China, Translations. KR

Subject Categories:

  • Anatomy and Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE