Document Detail

Effects of high-frequency breathing on pulmonary ventilation and gas exchange.
MedLine Citation:
PMID:  6662776     Owner:  NLM     Status:  MEDLINE    
The effects of spontaneous high-frequency breathing (HFB) on lung function were evaluated in three subjects highly trained in the practice of yoga. Transpulmonary pressure was measured by an esophageal balloon catheter and gas flow by pneumotachography. The abdominal and rib cage contributions to tidal breathing were measured separately by respiratory inductive plethysmography. Gas exchange was studied by the conventional technique and by multiple inert gas elimination. During HFB, respiratory rate increased to 232 cycles/min with a tidal volume of 0.35 liter. This resulted in a more than 10-fold increase in expired minute ventilation to approximately 90 1/min. The transpulmonary pressure varied by 20 cmH2O, with the calculated elastic, resistive, and accelerative components varying by 2, 20, and 8 cmH2O, respectively. Respiratory work increased more than 200-fold in comparison with resting ventilation. A phase shift between thoracic and abdominal breathing was observed and was interpreted as a volume displacement of approximately 30 1/min between the two parts of the respiratory system. Arterial oxygen and carbon dioxide tension remained normal. Bohr dead space increased, while acetone dead space remained unaltered. A bimodal distribution of ventilation-perfusion ratios (VA/Q) was observed, with one mode in normal and another in "high" VA/Q regions.
C Frostell; J N Pande; G Hedenstierna
Related Documents :
23075556 - Bovine colostrum and immune function after exercise.
6152616 - Ventilatory effects of nitrous oxide during continuous infusion of fentanyl or alfentanil.
6708786 - Anaerobic metabolism of the respiratory muscles during exercise.
17370916 - An assessment of gases in oxygen-deficient hay silos and the effects of forced ventilat...
5102196 - Relation of cardiovascular changes in fighting to emotion and exercise.
9528976 - Growth hormone and mild exercise in combination markedly enhance cortical bone formatio...
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of applied physiology: respiratory, environmental and exercise physiology     Volume:  55     ISSN:  0161-7567     ISO Abbreviation:  J Appl Physiol Respir Environ Exerc Physiol     Publication Date:  1983 Dec 
Date Detail:
Created Date:  1984-02-28     Completed Date:  1984-02-28     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  7801242     Medline TA:  J Appl Physiol Respir Environ Exerc Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1854-61     Citation Subset:  IM    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Lung / physiology*
Middle Aged
Pulmonary Gas Exchange*
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Effect of vasoactive intestinal peptide on ion transport across dog tracheal epithelium.
Next Document:  Speed of low-frequency sound through lungs of normal men.