The Effect of the M17A2 Mask on Spirometry Values in Healthy Subjects
Abstract
The effects of the M17A2 gas mask on respiratory function was evaluated using standard pulmonary function test measurements. Marine volunteers (58 males, 8 females) performed forced vital capacity (FVC) and maximum voluntary ventilation (MVV) maneuvers with and without the mask. The subjects were randomly assigned to be tested in the mask or the control condition first. The mask had significant effects on almost all the volumes and flows measured. There was a decrement of 200 ml in the mean FVC (p=.002) and in the forced expiratory volume in 1 second (FEV2, p=.001). The forced expiratory volume in .5 second FEV.5 dropped from 58 to 54% of the total FVC (p=.007), but the other proportional relationships were not changed. Higher baseline flows were correlated with greater drops in flow when the mask was worn (r=.64, p<.001). Mean MVV dropped by 24 liters (15%) (p<.001) in the masked condition. Females dropped their FEV1s by 17%, while males dropped by only 4% (p=.003), with similar nonsignificant trends on other measures. Unlike the overall group, smokers did not show a significant drop in FEV.5, FEV1, the enforced expiratory volume in 3 seconds or the forced expiratory flow rate during the middle half of the breath. Keywords: Operational effectiveness.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 29, 1987
- Accession Number
- ADA191941
Entities
People
- A. A. Sucec
- C. E. Englund
- D. A. Smith
- J. A. Yeager
- T. L. Kelly
Organizations
- Naval Health Research Center