Accession Number : ADA262287


Title :   Physiological Responses to Varying Workloads and Configurations of the MCU-2/P Chemical Defense Mask


Descriptive Note : Final rept. Jan-Aug 1992


Corporate Author : KRUG LIFE SCIENCES SAN ANTONIO TX SAN ANTONIO DIV


Personal Author(s) : Antunano, Melchor J ; Baumgardner, F W ; Chen, Yasu T ; Constable, Stefan H


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a262287.pdf


Report Date : Feb 1993


Pagination or Media Count : 37


Abstract : An objective of this study was to evaluate the breathing resistance characteristics of MCU-2/P and M-17 chemical defense masks during individual exposures to 8 consecutive incremental workloads. Other objectives included: evaluation of cardiorespiratory and subjective responses and testing of two commercially available blowers. Five MCU-2/P mask configurations were tested: mask without filter (MCU-OF), mask + 1 filter (MCU-1 F), mask + 2 filters (MCU- 2F), mask + 1 filter + blower A (MCU-1 F-ABA), and mask + blower B + 2 filters (MCU-ABB-2F). An M-17 mask was also tested. Each subject walked on a treadmill for 5 min at each of 8 consecutive incremental workloads (ranging from 26% to 77% of VO sub 2MAX) for a total of 40 min, while wearing each mask configuration. Variables measured included inspiratory and expiratory mask cavity pressures (IMCP and EMCP), mask cavity pressure-swing (MCPS), peak inspiratory airflow (PIAF), respiratory rate (RR), tidal volume (VT), minute volume (VE), heart rate (HR), perceived inspiratory & expiratory effort (PIE and PEE), and overall breathing discomfort (OBD). The MCU-1 F and M-1 7 masks imposed the same magnitudes of inspiratory resistance at any given workload. The highest inspiratory resistance was imposed by the MCU-1F and M-17 masks, while the lowest corresponded to the MCU-ABB-2F and MCU-2F. Either of these two masks can be expected to decrease individual tolerance to sustained physical work. The MCU-ABB-2F and the MCU-2F were the most effective methods to reduce the magnitude of inspiratory resistance at any given workload.... Breathing resistance, Protective mask, Exercise, Ventilation, Perceived effort.


Descriptors :   *RESPONSE(BIOLOGY) , *WORKLOAD , *BLOWERS , *BREATHING MASKS , *PROTECTIVE MASK FILTERS , PERFORMANCE(HUMAN) , CHEMICALS , VENTILATION , RATES , CAVITIES , VARIABLES , CONFIGURATIONS , CREWS , PRESSURE , TOLERANCE , RESPIRATION , HEART RATE , RESISTANCE(BIOLOGY) , EXERCISE(PHYSIOLOGY) , TREADMILLS


Subject Categories : Chemical, Biological and Radiological Warfare
      Life Support Systems


Distribution Statement : APPROVED FOR PUBLIC RELEASE