Differential respiratory muscle recruitment induced by clonidine in awake goats. J Appl Physiol (1985) 1998 Apr;84(4):1198-207
Date
05/09/1998Pubmed ID
9516185DOI
10.1152/jappl.1998.84.4.1198Scopus ID
2-s2.0-0031944642 (requires institutional sign-in at Scopus site) 18 CitationsAbstract
The purpose of this study was to test the hypothesis that dysrhythmic breathing induced by the alpha2-agonist clonidine is accompanied by differential recruitment of respiratory muscles. In adult goats (n = 14) electromyographic (EMG) measurements were made from inspiratory muscles (diaphragm and parasternal intercostal) and expiratory muscles [triangularis sterni (TS) and transversus abdominis (Abd)]. EMG of the thyroarytenoid (TA) muscle was used as an index of upper airway (glottal) patency. Peak EMG activities of all spinal inspiratory and expiratory muscles were augmented by central and peripheral chemoreceptor stimuli. Phasic TA was apparent in the postinspiratory phase of the breathing cycle under normoxic conditions. During dysrhythmic breathing episodes induced by clonidine, TS and Abd activities were attenuated or abolished, whereas diaphragm and parasternal intercostal activities were unchanged. There was no tonic activation of TS or Abd EMG during apneas; however, TA activity became tonic throughout the apnea. We conclude that 1) alpha2-adrenoceptor stimulation results in differential recruitment of respiratory muscles during respiratory dysrhythmias and 2) apneas are accompanied by active glottic closure in the awake goat.
Author List
Hedrick MS, Dwinell MR, Janssen PL, Pizarro J, Bisgard GEAuthor
Melinda R. Dwinell PhD Professor in the Physiology department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
Adrenergic alpha-2 Receptor AgonistsAdrenergic alpha-Agonists
Animals
Apnea
Clonidine
Dopamine
Electromyography
Glottis
Goats
Respiratory Mechanics
Respiratory Muscles