Factors influencing the measurement of closing volume.

Details

• Personal Author:
  Lapp, N. Leroy ; Make B
• Description:
  Factors influencing the measurement of closing volume are studied with the single-breath nitrogen test on nine healthy nonsmokers. Time of day, day of the week, and preceding volume history have no effect on either closing volume or alveolar plateau. Slow inspiratory flow results in larger ratio of closing volume to vital capacity, ratio of closing capacity to total lung capacity and change in nitrogen concentration than does fast inspiratory flow. Voluntary regulation of the expiratory flow results in smaller ratios of closing volume to vital capacity and closing volume to vital capacity and ratio of closing capacity to total lung capacity. To obtain uniform, comparable closing volumes, it is suggested that subjects inspire slowly, control expiratory flow voluntarily and not pause between inspiration and expiration. [Description provided by NIOSH]
• Subjects:
  Lung Occupational Health Respiratory Function Tests Respiratory System Respiratory Tract Diseases Safety
• Keywords:
  Chronic-airway-obstruction Lung-capacity Lung-volume Lung-volume-measurement Respiratory-function-tests Respiratory-gases Respiratory-system-disorders Variations
• ISSN:
  0003-0805
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  ALFORD - Appalachian Laboratory for Occupational Respiratory Disease
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  111
• Issue:
  6
• NIOSHTIC Number:
  nn:00050876
• Citation:
  Am Rev Respir Dis 1975 Jun; 111(6):749-754
• CAS Registry Number:
  Nitrogen (CAS RN 7727-37-9)
• Federal Fiscal Year:
  1975
• Peer Reviewed:
  True
• Source Full Name:
  American Review of Respiratory Disease
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:30e360ff5452738998a735d3dcd7c55e39433a68b72fbc5a8d3272aee5d8a3e44562905b2b72470a9a0204e93e6f43d33a9bb023ee8cd62801d57fe72031b40c
• Download URL:
  https://stacks.cdc.gov/view/cdc/184060/cdc_184060_DS1.pdf
• File Type:
  [PDF - 420.20 KB ]