Document Detail

High-frequency oscillation and centroid frequency of diaphragm EMG during inspiratory loading.
MedLine Citation:
PMID:  9749953     Owner:  NLM     Status:  MEDLINE    
Power spectra were derived from the diaphragm electromyogram (EMG) in anesthetized rabbits subjected to inspiratory resistive loading (IRL) with airway pressure swings of 40-60 cm H2O for 20 min to 2 h. Shifts in the centroid frequencies of the power spectra were found to be associated with the appearance of power spectral peaks in the range of 105-140 Hz, termed high-frequency oscillation, or HFO. Such peaks have been described before in phrenic nerve activity and in the diaphragm EMG. However, these peaks have not previously been connected with the shifts in centroid frequency seen during loaded breathing. Although such changes in frequency content have been taken to indicate fatigue in the diaphragm, we find that HFO can also cause a shift in centroid frequency during loaded breathing, an effect whose relation to fatigue has yet to be established.
A M Cairns; J D Road
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Respiration physiology     Volume:  112     ISSN:  0034-5687     ISO Abbreviation:  Respir Physiol     Publication Date:  1998 Jun 
Date Detail:
Created Date:  1998-12-09     Completed Date:  1998-12-09     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0047142     Medline TA:  Respir Physiol     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  305-13     Citation Subset:  IM    
Division of Respiratory Medicine, Vancouver Hospital & Health Sciences Centre, BC, Canada.
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MeSH Terms
Air Pressure
Airway Resistance / physiology
Diaphragm / innervation,  physiology*
Muscle Fatigue / physiology
Phrenic Nerve / physiology
Respiratory Mechanics / physiology*

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

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