PMID: 6408048May 1, 1983Paper

Hyperventilation in ponies at the onset of and during steady-state exercise

Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
L G PanM A Busch

Abstract

We studied blood gases in ponies to assess the relationship of alveolar ventilation (VA) to pulmonary CO2 delivery during moderate treadmill exercise. In normal ponies for 1.8, 3, or 6 mph, respectively, partial pressure of CO2 in arterial blood (PaCO2) decreased maximally by 3.1, 4.4, and 5.7 Torr at 30-90 s of exercise and remained below rest by 1.4, 2.3, and 4.5 Torr during steady-state (4-8 min) exercise (P less than 0.01). Partial pressure of O2 in arterial blood (PaO2) and arterial pH, (pHa) also reflected hyperventilation. Mixed venus CO2 partial pressure (PVCO2) decreased 2.3 and 2.9 Torr by 30 s for 3 and 6 mph, respectively (P less than 0.05). In work transitions either from 1.8 to 6 mph or from 6 mph to 1.8 mph, respectively, PaCO2 either decreased 3.8 Torr or increased 3.3 Torr by 45 s of the second work load (P less than 0.01). During exercise in acute (2-4 wk) carotid body denervated (CBD) ponies at 1.8, 3, or 6 mph, respectively, PaCO2 decreased maximally below rest by 9.0, 7.6, and 13.2 Torr at 30-45 s of exercise and remained below rest by 1.3, 2.3, and 7.8 Torr during steady-state (4-8 min) exercise (P less than 0.1). In the chronic (1-2 yr) CBD ponies, the hypocapnia was generally greater than normal but less...Continue Reading

Citations

May 27, 2011·Equine Veterinary Journal. Supplement·N D MeyerB K Slinker
Oct 31, 2012·Equine Veterinary Journal·S H FranklinW M Bayly
Jan 18, 2003·Journal of Applied Physiology·H V Forster
Jul 9, 1998·Journal of Applied Physiology·P L EntinR E Rawson
Aug 17, 2002·Journal of Applied Physiology·Matthew R HodgesGenevieve E Hogan
Feb 26, 1998·Journal of Applied Physiology·T HardarsonT Sveinsson
Sep 2, 2009·Clinical and Experimental Pharmacology & Physiology·C JanssenP van de Borne
Jan 13, 2015·Journal of Applied Physiology·Philippe Haouzi
Jan 1, 1995·European Journal of Applied Physiology and Occupational Physiology·J H Mateika, J Duffin
Sep 14, 1999·Journal of Applied Physiology·T F LowryM Forster
Nov 2, 2011·Experimental Physiology·Naoto TsuchiyaIkuo Homma
Oct 7, 1998·Journal of Applied Physiology·L G PanA L Forster
Sep 1, 1995·Canadian Journal of Applied Physiology = Revue Canadienne De Physiologie Appliquée·H V Forster, L G Pan
Dec 1, 1983·Respiration Physiology·C A SmithJ A Dempsey

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