Document Detail

Effect of dorsal displacement of the soft palate on ventilation and airflow during high-intensity exercise.
MedLine Citation:
PMID:  12405720     Owner:  NLM     Status:  MEDLINE    
Dorsal displacement of the soft palate (DDSP) is one of the most common obstructive conditions of the upper respiratory tract in the racehorse. The present study was conducted to determine the effects of intermittent dorsal displacement of the soft palate (DDSP) on ventilation and respiratory airflow during high intensity exercise. Videoendoscopic recordings were made of the nasopharynx and larynx simultaneously with measurements of airflow and respiratory gas exchange, during high-speed treadmill exercise in 9 horses with confirmed intermittent DDSP admitted for clinical investigation of poor racing performance. In all horses, DDSP resulted in a reduction in minute ventilation (VE) (P<0.001), associated with a decrease in tidal volume (VT) (P<0.01) with no change in breathing frequency (f) and a reduction in oxygen consumption (VO2) (P<0.01). Further, DDSP resulted in reduction of expiratory flow parameters, including peak expiratory flow (PEF), EF50, EF25 and EF125 (P<0.01), with no alteration of inspiratory flow. These results confirm that naturally-occurring intermittent DDSP creates a flow-limiting expiratory obstruction. The associated impairment of athletic performance is probably caused, at least in part, by the accompanying decrease of oxygen uptake.
S H Franklin; J R J Naylor; J G Lane
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Equine veterinary journal. Supplement     Volume:  -     ISSN:  -     ISO Abbreviation:  Equine Vet J Suppl     Publication Date:  2002 Sep 
Date Detail:
Created Date:  2002-10-30     Completed Date:  2003-02-26     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9614088     Medline TA:  Equine Vet J Suppl     Country:  England    
Other Details:
Languages:  eng     Pagination:  379-83     Citation Subset:  IM    
Equine Centre, Department of Anatomy, University of Bristol, Langford, UK.
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MeSH Terms
Airway Obstruction / pathology,  physiopathology,  veterinary*
Airway Resistance / physiology*
Endoscopy / veterinary
Exercise Test / veterinary
Horse Diseases / pathology,  physiopathology*
Palate, Soft / pathology,  physiopathology*
Physical Conditioning, Animal / physiology*
Physical Exertion
Pulmonary Gas Exchange / physiology
Video Recording

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

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