Respiratory stress and occupational respirator wear. Terminal progress report.
University of Maryland, College Park Maryland, 1982 Jan; :1-17
Experiments on respiratory stress and respiratory mask parameters were assessed. A theoretical model to predict exhalation time as a function of the respiratory period and the ratio of inhalation to exhalation time for subjects exercising while wearing respiratory masks was developed. Twenty male subjects, aged 20 to 50, were given pulmonary function tests, including oxygen O2) uptake and airways resistance, before and during exercise on a bicycle ergometer. Subjects exercised under three work loads with and without respiratory masks. An airflow perturbation device for measuring airways resistance was developed. Airways resistance was measured using 350 to 400 pound pigs in preliminary experiments. No correlation between minimum exhalation time and maximum O2 uptake was found in the ergometer experiments. The minimum exhalation time was not the only variable involved in mask related respiratory difficulty. The author concludes that exhalation does not limit O2 uptake for healthy individuals. Airways resistance measurements in pigs have yielded values within the predicted range of 0.77 to 1.70 and 0.61 to 1.61 for exhalation and inhalation resistance, respectively.
NIOSH-Grant; Humans; Respiratory-gas-transport; Safety-equipment; Control-technology; Analytical-models; Industrial-design; Protective-equipment; Mathematical-models
Final Grant Report
NTIS Accession No.
University of Maryland, College Park Maryland
Health Education University of Maryland Sports Med & Phys Fitness Ctr College Park, MD 20742