Reference : Inertance of the Respiratory System in Ponies
Scientific journals : Article
Life sciences : Anatomy (cytology, histology, embryology...) & physiology
Life sciences : Veterinary medicine & animal health
Inertance of the Respiratory System in Ponies
Art, Tatiana mailto [Université de Liège - ULiège > Département de sciences fonctionnelles > Phys. neuro-muscul., de l'effort - Méd. sport. des animaux >]
Lekeux, Pierre mailto [Université de Liège - ULiège > Département de sciences fonctionnelles > Physiologie >]
Gustin, Pascal mailto [Université de Liège - ULiège > Département de sciences fonctionnelles > Pharmacologie, pharmacothérapie et toxicologie >]
Desmecht, Daniel mailto [Université de Liège - ULiège > Département de morphologie et pathologie > Pathologie spéciale et autopsies >]
Amory, Hélène mailto [Université de Liège - ULiège > Département clinique des animaux de compagnie et des équidés > Médecine interne des équidés >]
Paiva, M. [Université de Liège - ULiège > > > > > >]
Journal of Applied Physiology (Bethesda, Md. : 1985)
American Physiological Society
Yes (verified by ORBi)
[en] pulmonary inertance ; inertial pressure ; mechanics of breathing in ponies ; exercise
[en] The purpose of the present work was to measure the pulmonary inertance (IL) in ponies and to analyze its potential influence on the mechanics of breathing and on their aptitude to increase ventilation during exercise. Five healthy ponies 2.4-4 yr old [mean wt 255 +/- 15 (SE) kg] were used. On the one hand, inertance of the respiratory system (Irs) was computed from the value of the resonant frequency (fr) measured by the forced oscillation technique. On the other hand, respiratory airflow, tidal volume (VT), and transpulmonary pressure (PL) changes were recorded while the ponies were performing a light treadmill exercise, and IL was calculated as the ratio of the associated differences in inertial pressure (delta Pin) to volume acceleration (delta V). Respiratory airflow and VT were measured with a Fleisch pneumotachograph (no. 5) and PL with an intraesophageal balloon catheter. First, the protocol was carried out with the ponies breathing air and He-O2, second, while the ponies breathed through two additional tubes (100 cm long, 3 cm ID), then one, and finally none, fixed on the Fleisch pneumotachograph. Finally, the contribution of the extra- vs. the intrathoracic airways to IL was estimated by measuring the lateral midtracheal pressure recorded simultaneously with the aforementioned parameters. The values of Irs calculated with fr and of IL calculated on the basis of the delta Pin-delta V ratio were 29.8 +/- 0.4 and 19.8 +/- 1.0.10(-4) kPa.l-1.s-2, respectively. During He-O2 breathing IL decreased about three times; this result was similar to the predicted decrease based on gas density only.(ABSTRACT TRUNCATED AT 250 WORDS)
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