Response of the inspiratory intercostal [correction of intercoastal] muscles to increased inertial loads

Respiration Physiology
A LegrandA De Troyer

Abstract

To test the hypothesis that the external intercostals and levator costae constitute an inspiratory reserve system, we have examined the response of these muscles to increased inertial loads. Weights were t hus attached sequentially to the ribs in ten lightly anesthetized, spontaneously breathing dogs. As weights were attached, the ribs were progressively displaced caudally at end-expiration, so that the external intercostal muscles were lengthened. In addition, the cranial motion of the ribs during inspiration was gradually reduced, the inspiratory shortening of external intercostal disappeared, and the external intercostal and levator costae inspiratory EMG activities increased. The parasternal intercostal inspiratory activity, however, remained unchanged. Studies also showed that: (1) the increases in external intercostal activity appeared with the first loaded breath and disappeared as soon as the load was removed; (2) these increases were related to the suppression of the inspiratory muscle shortening, rather than to the increase in precontraction muscle length or to vagal inputs; and (3) denervation of the external intercostal caused inspiratory muscle lengthening but had little effect on the inspiratory motion of the ribs...Continue Reading

References

Oct 1, 1965·The Journal of Physiology·G Sant'Ambrogio, J G Widdicombe
Oct 1, 1963·The Journal of Physiology·V CRITCHLOW, VON EULER
Mar 1, 1965·Acta Physiologica Scandinavica·M CORDA VON EULER

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Citations

May 29, 2012·Respiratory Physiology & Neurobiology·Adeline BonaertAlexandre Legrand
Sep 14, 1999·Journal of Applied Physiology·P A EastonA de Troyer

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