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Results for “INTERCOSTAL MUSCLES”

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At least 1,189 records · Page 66Linked to original sources
PubMed1973

The tone of respiratory muscles in acute changes of circulation induced by acetylcholine.

The role of respiratory muscles in acute changes of circulation and ventilation due to acetylcholine in anaesthetized spontaneously breathing rabbits was investigated. Significant increase of end-expiratory thoracic circumference and insignificant increase of abdominal one was found and was taken as a measure of changed respiratory muscles tone. The authors emphasize the important role of the respiratory muscles in the regulation of the thoracic and the abdominal volume. The increased lung volume is due to the action of the respiratory muscles of thorax and diaphragm. The abdominal muscles and diaphragm may regulate the abdominal volume and play important part in the redistribution of the blood.

Abdominal Muscles↗
PubMed1989

In vitro Na+,K+-ATPase (EC 3.6.1.3)-dependent respiration and protein synthesis in skeletal muscle of pigs fed at three dietary protein levels.

1. Eighteen pigs were offered diets containing 130, 170 or 210 g protein/kg with three barrows and three gifts per diet from 20 to 60 kg live weight. Oxygen consumption, Na+,K+-ATPase (EC 3.6.1.3)-dependent and -independent respiration and protein synthesis were measured in vitro in intercostal and sartorius muscle preparations from these pigs. 2. Increasing dietary protein concentration increased (P less than 0.01) daily gain and dissectible muscle in carcass. 3. O2 consumption and Na+,K+-ATPase-dependent respiration of the intercostal and sartorius muscles increased linearly (P less than 0.01) with increase in dietary protein concentration. The requirement for the support of the transport of Na+ and K+ across the cell membrane in these muscles, on average, accounted for 22-25% of the O2 consumption. 4. Synthesis rate (mg/g per d) of protein in the sartorius muscle increased (P less than 0.05) from 3.05 to 5.07 and increased (P less than 0.1) from 2.57 to 4.06 in the intercostal muscle as dietary protein increased from 130 to 210 g/kg diet. 5. Regression of Na+,K+-ATPase-dependent respiration against protein synthesis in each of intercostal and sartorius muscles showed a linear relation, an attestation of a close link between productive processes and auxiliary energy expenditure.

Animals↗
PubMed1990

Responses of inspiratory neurons of the dorsal respiratory group to stimulation of expiratory muscle and vagal afferents.

In decerebrate, paralyzed and ventilated cats, we monitored the intracellular responses of 30 inspiratory neurons of the dorsal respiratory group (DRG) to stimulation of vagal and expiratory muscle (internal intercostal and abdominal) afferents. We hypothesized that the inhibitory effects of stimulation of expiratory muscle afferents, previously reported, would block the excitatory responses of inspiratory neurons of the DRG to vagal stimulation. Although prolonged stimulus trains to expiratory muscle afferents caused respiratory phase-switching, single shocks or short trains elicited no responses in 17 bulbospinal neurons, excitatory responses in 6, and inhibitory responses in 2. Of the 4 propriobulbar neurons tested, 2 had inhibitory responses and 2 did not respond. In only 2 neurons, both bulbospinal, did conditioning stimuli to expiratory muscle afferents block or reduce the excitatory effects of vagal stimulation. These results suggest that interaction of vagal and expiratory muscle afferents, which might account for the absence of a change in inspiratory duration despite increased vagal afferent feedback at elevated end-expiratory lung volumes, does not occur within the DRG.

Action Potentials↗