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Respirator effect on oral-nasal flow partition.
Harber P; Beck J; Luo J
NIOSH 1992 Jan; :1-12
Respirators (respiratory personal protector devices) are used by many industrial workers for protection against inhaled toxins. While it was considered traditionally that ventilatory limitation accounted for poor tolerance of them by many workers, more recent analyses have suggested that tolerance is multi-factorial. Understanding of the factors leading to respirator tolerance is likely to improve the design of respirators, establish appropriate medical certification procedures, and provide insight into causes for workers who are particularly intolerant. Several studies have suggested that the respiratory pattern, rather than simply respiratory work to overcome resistance of the respirator, may be important as a determinant of the effect of respirators. Previous studies of respiratory control adaptation to respirator use have emphasized respiratory timing and intensity control. This study evaluated another aspect, the switching of airflow from the nasal route to the oral route. This can affect respiratory sensation directly, or by changing inspired air conditions, or total airway resistance.
Respirators; Respiratory-protective-equipment; Personal-protective-equipment; Tolerance-threshold; Equipment-design; Medical-screening; Breathing; Airway-resistance; Adaptation; Physiological-factors; Psychological-adaptation; Oral-cavity; Nasal-cavity; Air-flow
University of California, Department of Medicine, Occupational Medicine Branch, Los Angeles, CA 90024-7027
Final Grant Report
University of California, Department of Medicine, Occupational Medicine Branch, Los Angeles, California
Page last reviewed: May 5, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division