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J Appl Physiol 20: 491-495, 1965;
8750-7587/65 $5.00
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Increase in breathing frequency following the reflex deep breath in anesthetized cats

Leslie B. Reynolds JR. 1 and Mata D. Hilgeson 1

1 Department of Physiology, Northwestern University Medical School, Chicago, Illinois

In anesthetized cats, the inspiration-augmenting reflex, manifested as a spontaneous deep breath, was followed by a transient increase in breathing frequency in 66.5% of 382 cases observed. To determine whether this frequency increase was a property of altered mechanical properties of the lungs or was a property of the reflex itself, intact animals had their lungs inflated under conditions which would elicit the reflex as well as under conditions in which the reflex was absent. In all cases, dynamic lung compliance increased when the lungs were stretched. When the augmenting reflex was absent, breathing frequency decreased with increasing stretch. However, when the reflex occurred, breathing frequency increased to a maximum at a lung stretch of two and one-half times tidal volume. Frequency effects observed could be attributed to a combination of slowing by lung stretch and reflex speeding effects. The inspiration-augmenting reflex is proposed as a possible contributing mechanism to the tachypnea associated with lung conditions in which compliance is low.

lung compliance; inspiration-augmenting reflex; breathing frequency changes; pulmonary airflow resistance; control of respiration; reflex tachypnea

Submitted on May 18, 1964




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