ISSN:
1432-2013
Keywords:
Treatmill running
;
Pekin ducks
;
Arterial chemoreceptors
;
Control of breathing
;
Exercise hyperpnea
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract To determine if arterial chemoreceptors contribute to the ventilatory response during exercise, we measured minute ventilation ( $$\dot V$$ 1) in spontaneously breathing Pekin ducks (Anas platyrhynchos) during rest and running exercise when the inspired gas was switched from either 21% or 12% O2 to 100% O2 for 45 s (O2-test). In normoxia at rest (PaO2=99 Torr), inhaling 100% O2 reduced $$\dot V$$ 1 by 30%, while during resting hypoxic conditions, (PaO2=56 Torr), 100% O2 inhalation reduced $$\dot V$$ 1 by 66%. During exercise, abruptly inhaling 100% O2 decreased $$\dot V$$ 1 by only 14% and 33% in normoxic and hypoxic conditions, respectively. Thus, only a small fraction of the ventilatory response during exercise under normoxic conditions is due to an arterial chemoreceptor input. However, during exercise in hypoxic conditions, arterial chemoreceptors provide a substantial portion of the total drive to ventilation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00583329
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