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Lack of long-term facilitation of ventilation after exposure to hypoxia in goats. Respir Physiol 1997 Apr;108(1):1-9 PMID: 9178372

Pubmed ID

9178372

Abstract

Episodic hypoxia has been shown to induce augmented normoxic ventilatory drive or long-term facilitation (LTF, continued hyperventilation after termination of hypoxic stimulation) in awake dogs and awake goats. The main objective of these experiments was to examine whether continuous isocapnic hypoxia in awake goats elicits LTF and additionally, to determine if goats exhibit hypoxic ventilatory decline (roll-off) during the hypoxic exposure. Goats were exposed to either 4 h of isocapnic hypoxia (n = 10) or 30 min of isocapnic hypoxia (n = 7). Ventilation (VE), tidal volume and frequency were measured before, during and following the end of the isocapnic hypoxia (PaO2 40 Torr) exposure. During the 4 h period of hypoxia, VE increased in a time-dependent manner in a typical pattern of acclimatization, reaching a mean of 40.8 +/- 3.6 L/min at the end of 4 h. Five minutes after return to normoxia, VE was 13.0 +/- 0.8 L/min, not different than control VE (13.1 +/- 0.9 L/min) measured prior to the hypoxic exposure and remained unchanged from this value for another 30 min. During the 30 min hypoxic exposure, VE increased upon exposure to hypoxia, remained significantly elevated throughout the hypoxic exposure, but promptly returned to control levels upon return to normoxia. These results indicate that continuous isocapnic hypoxia elicits neither long term facilitation of ventilation nor hypoxic ventilatory decline in awake goats.

Author List

Dwinell MR, Janssen PL, Bisgard GE

Author

Melinda R. Dwinell PhD Center Associate Director, Associate Professor in the Physiology department at Medical College of Wisconsin




Scopus

2-s2.0-0030920213   31 Citations

MESH terms used to index this publication - Major topics in bold

Animals
Goats
Hypoxia
Long-Term Potentiation
Oxygen Consumption
Pulmonary Ventilation
Time Factors
jenkins-FCD Prod-332 f92a19b0ec5e8e1eff783fac390ec127e367c2b5