Bronchoprotective and bronchodilatory effects of deep inspiration in rabbits subjected to bronchial challenge
Departments of 1 Cellular and Integrative Physiology and 2 Pediatrics, Indiana University School of Medicine, Indianapolis, Indiana 46223 The effect of deep inspiration (DI) on airway responsiveness differs in asthmatic and normal human subjects. The mechanism for the effects of DI on airway respo...
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Published in | Journal of applied physiology (1985) Vol. 91; no. 6; pp. 2511 - 2516 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Bethesda, MD
Am Physiological Soc
01.12.2001
American Physiological Society |
Subjects | |
Online Access | Get full text |
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Summary: | Departments of 1 Cellular and Integrative Physiology and
2 Pediatrics, Indiana University School of Medicine,
Indianapolis, Indiana 46223
The effect of deep
inspiration (DI) on airway responsiveness differs in asthmatic and
normal human subjects. The mechanism for the effects of DI on airway
responsiveness in vivo has not been identified. To elucidate potential
mechanisms, we compared the effects of DI imposed before or during
induced bronchoconstriction on the airway response to methacholine
(MCh) in rabbits. The changes in airway resistance in response to
intravenous MCh were continuously monitored. DI depressed the maximum
response to MCh when imposed before or during the MCh challenge;
however, the inhibitory effect of DI was greater when imposed during
bronchoconstriction. Because immature rabbits have greater airway
reactivity than mature rabbits, we compared the effects of DI on their
airway responses. No differences were observed. Our results suggest
that the mechanisms by which DI inhibits airway responsiveness do not
depend on prior activation of airway smooth muscle (ASM). These results
are consistent with the possibility that reorganization of the
contractile apparatus caused by stretch of ASM during DI contributes to
depression of the airway response.
airway reactivity; volume history; maturation; smooth muscle
plasticity |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 8750-7587 1522-1601 |
DOI: | 10.1152/jappl.2001.91.6.2511 |