Accession Number : ADA317875

Title :   Performance Decrements in Constant Load Work for Specific Inspiratory and Expiratory Breathing Resistances.

Descriptive Note : Final rept. Aug 94-Mar 95,

Corporate Author : EDGEWOOD RESEARCH DEVELOPMENT AND ENGINEERING CENTER ABERDEEN PROVING GROUND MD

Personal Author(s) : Caretti, David M.

PDF Url : ADA317875

Report Date : AUG 1996

Pagination or Media Count : 20

Abstract : This study developed estimates of work performance for specific levels of inspiratory and expiratory resistances. Exercise performance and subjective responses were measured in 5 volunteers during constant load, high intensity work under mask conditions of altered inspiratory resistance (I) and altered inspiratory and expiratory resistance (l+E). Mask performance ratings decreased approximately 17%, 25%, and 42% as inspiratory resistances were increased to 20 mm H2O, 30 mm H2O, and 40 mm H2O from the control mask level of 9 mm H2O and expiratory resistance was unaltered. When mask expiratory resistance was increased, performance decrements were 5%, 14%, and 34%, respectively. These observations emphasize the fact that even low levels of breathing resistance will impact performance. However, they also suggest that even slight reductions in the inspiratory and expiratory resistances of current negative pressure masks could improve wearer performance under physical stresses similar to the exercise intensity employed in this study.

Descriptors :   *BREATHING APPARATUS, *RESISTANCE(BIOLOGY), *PULMONARY FUNCTION, *BREATHING MASKS, STRESSES, CONTROL, IMPACT, DEGRADATION, PERFORMANCE(HUMAN), PHYSICAL PROPERTIES, LOADS(FORCES), INTENSITY, RESPONSE, CONSTANTS, PRESSURE, LOW LEVEL, WORK, HIGH INTENSITY, RESPIRATION, MASKS, EXERCISE(PHYSIOLOGY).

Subject Categories : Protective Equipment
      Life Support Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE