[Impulse activity of slow-adapting lung receptors during forced breathing].
Impulse activity of 34 pulmonary slow-adapting receptors (SAR) has been investigated in anesthetized cats during quiet and CO2-inhalation-forced breathing. Impulse activity in about half the investigated SARs during inspiration under forced breathing was not changed significantly as compared with quiet breathing, the activity of SARs enhanced with the lung volume. Such conditions induced a shift of the frequency-volume (F-V) curve to the right in most of the remaining receptors or growth of their impulse frequency steepness with inspiration. Their F-V relationship character was not disturbed if lung volume did not exceed the respiratory volume. During expiration the discharge frequency of all the investigated SARs decreased. The F-V relationship of the afferent output from all the investigated SARs, characterized by averaged frequency of their impulses, was nonlinear during forced breathing as well as during quiet breathing, but it differed in greater steepness of the frequency growth. Causes of changes in the impulse activity of the investigated SARs under forced breathing and possible effects of such changes on the phase duration control in a respiratory cycle are discussed.
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D000222:Adaptation, Physiological / Q000502:physiology*; D000818:Animals; D002245:Carbon Dioxide / Q000502:physiology; D002415:Cats; D008176:Lung Volume Measurements; D008465:Mechanoreceptors / Q000502:physiology*; D011661:Pulmonary Stretch Receptors / Q000502:physiology*; D015656:Respiratory Mechanics / Q000502:physiology*
D002245:Carbon Dioxide
Impul'snaia aktivnost' medlennoadaptiruiushchikhsia retseptorov legkikh pri usilennom dykhanii.