Nasal-Oral Flow Partition with Respirator Use

Details

• Personal Author:
  Beck J ; Harber P ; Hsu P ; Luo J
• Description:
  Breathing through the oral route (versus nasal) significantly decreases the total airflow resistance but also bypasses the benefits of nasal "air conditioning". Therefore changes in the partitioning of airflow between the nasal (N) and oral (O) routes may affect respirator tolerance. Eleven healthy volunteers performed progressive work on a bicycle ergometer while wearing a full face mask respirator under the following conditions: Disconnected (D) from apparatus; No Load (N; small resistance du to pneumotachometer and spriometer); Inspiratory Resistance (I) using a single respirator cartridge; Pressure Bias (P; simulating pressure demand respirator with a 10cm Peep valve). N-O partition was determined by a short time constant thermistor adjacent to mouth. As sown by the figure (and confirmed by ANCOVA analysis) increasing exercise led to a shift N to O. In addition, respirator related resistance (I) and pressure loads (P) caused a shift from nasal to oral breathing particularly at higher exercise levels. [Description provided by NIOSH]
• Subjects:
  Occupational Health Personal Protective Equipment Respiratory Protective Devices Respiratory System Safety
• Keywords:
  Airflow Breathing Personal Protective Equipment Physical Exercise PPE Respirators Respiratory Protective Equipment
• ISSN:
  0003-0805
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Abstract or Summary
• Place as Subject:
  California ; OSHA Region 9
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  143
• NIOSHTIC Number:
  nn:20058588
• Citation:
  Am Rev Respir Dis 1991 Jan; 143:A104
• Federal Fiscal Year:
  1991
• Performing Organization:
  University of California Los Angeles, Los Angeles, California
• Peer Reviewed:
  False
• Start Date:
  19840801
• Source Full Name:
  American Review of Respiratory Disease
• End Date:
  19970331
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:a71ebe82090732639df95ace41cd84b34ec8c371b30057fed82a2e88f06549d1ef740ea9fdcbe191a76b25007e1df9908f8298113f720930f3c0e5824c193654
• Download URL:
  https://stacks.cdc.gov/view/cdc/221647/cdc_221647_DS1.pdf
• File Type:
  [PDF - 261.48 KB ]