Response of the canine internal intercostal muscles to chest wall vibration

Although high-frequency mechanical vibration of the rib cage reduces dyspnea, its effects on the respiratory muscles are largely unknown. We have previously shown that in anesthetized dogs, vibrating the rib cage during inspiration elicits a marked increase in the inspiratory electromyographic (EMG)...

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Bibliographic Details
Published in:American journal of respiratory and critical care medicine 2001, Vol.163 (1), p.49-54
Main Authors: LEDUC, Dimitri, BRUNKO, Eric, DE TROYER, André
Format: Article
Language:English
Subjects:
Air breathing
Animals
Biological and medical sciences
Dogs
Fundamental and applied biological sciences. Psychology
Intercostal Muscles - physiology
Respiratory system: anatomy, metabolism, gas exchange, ventilatory mechanics, respiratory hemodynamics
Thorax
Tidal Volume
Vertebrates: respiratory system
Vibration
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Summary:Although high-frequency mechanical vibration of the rib cage reduces dyspnea, its effects on the respiratory muscles are largely unknown. We have previously shown that in anesthetized dogs, vibrating the rib cage during inspiration elicits a marked increase in the inspiratory electromyographic (EMG) activity recorded from the external intercostal muscles but does not affect tidal volume (VT). In the present studies, we have tested the hypothesis that the maintenance of VT results from the concomitant contraction of the internal interosseous (expiratory) intercostals. When the rib cage was vibrated (40 Hz) during hyperventilation-induced apnea, a prominent activity was recorded from the external intercostals but no activity was recorded from the internal intercostals, including when the muscles were lengthened by passive inflation. The internal intercostals remained also silent when vibration was applied during spontaneous inspiration, and the phasic expiratory EMG activity recorded from them was unaltered when vibration was applied during expiration. Thus, the internal interosseous intercostals in dogs are much less sensitive to vibration than the external intercostals, and they do not interfere with the action of these latter during rib cage vibration. This lack of sensitivity might be the result of a reflex inhibition of the muscle spindle afferents by afferents from external intercostal muscle spindles.
ISSN:1073-449X
1535-4970
DOI:10.1164/ajrccm.163.1.2004166