Tonic vagal influences on inspiratory duration.

Respiration Physiology
E DAngelo, E Agostoni

Abstract

The tidal volume (VT), inspiratory (Ti) and expiratory (Te) durations were determined in anesthetized rabbits, cats and dogs under normal conditions, during continuous positive or negative pressure breathing. Elastic loads up to complete occlusion of the airways were applied in order to determine the VT-Ti and Te-Ti relationships. The larger the end-expiratory lung volume the steeper the VT-Ti relationship, the smaller the increase of Ti and the greater the increase of Te produced by the load. Hence, the larger the end-expiratory lung volume the steeper the Te-Ti relationship. In vagotomized animals airways occlusion did not affect Ti and Te. Ti of occluded breaths in vagotomized animals was longer than that of occluded breaths in intact animals, whereas Te was similar at the resting volume of the respiratory system (FRC), shorter above FRC and longer below FRC. These results show that both phasic and tonic vagal discharges determine Ti and Te.

References

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Citations

Feb 1, 1991·Electroencephalography and Clinical Neurophysiology·E BalzamoY Jammes
Jul 1, 1976·Respiration Physiology·E Agostoni, E D'Angelo
Jul 1, 1976·Respiration Physiology·G D IsazaN S Cherniack
Nov 1, 1976·Respiration Physiology·E D'AngeloE Agostoni
Sep 1, 1979·Respiration Physiology·C L Webber, C N Peiss
Sep 1, 1980·Respiration Physiology·G Miserocchi, B Quinn
Jun 1, 1983·Respiration Physiology·S R Muza, D T Frazier
Oct 1, 1983·Respiration Physiology·Y JammesS Delpierre
Mar 1, 1987·Respiration Physiology·D A SchneiderJ F Green
Jul 1, 1988·Respiration Physiology·M P CaldeiraW A Zin
Mar 10, 2001·Respiration Physiology·E S Schelegle, J F Green
Apr 20, 2001·Respiration Physiology·E S SchelegleA T Chen
Jul 3, 2002·Respiratory Physiology & Neurobiology·Edgardo D'AngeloFrançois Bellemare
Sep 10, 1998·American Journal of Respiratory and Critical Care Medicine·M L CarlJ F Green
Feb 1, 1977·Archives internationales de physiologie et de biochimie·S DelpierreC Grimaud
Aug 10, 2002·American Journal of Physiology. Endocrinology and Metabolism·Pu-Qing Yuan, Hong Yang
Jun 10, 2000·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·X Zhang, E N Bruce
Jul 12, 2001·American Journal of Physiology. Gastrointestinal and Liver Physiology·P Q YuanH Yang

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