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In a recent communicon (19) we reported on the temporal changes in ipiratory-inhibiting effect in the course of a brief (-1.0 s) vagal ipiratory-inhibiting . We found that the effect of the increases progressively, reaching a maximum -0.8 s after applicon. Thereafter, the effect of the declines. In the present communicon we describe the respoe dynamics in the course of much longer stimuli (-20 s). In addition, we report on the changes in excitability of the timing mechanisms in the immediate (Cl.0 s) and late (l-20 s) post periods. METHODS Twenty-three cats (3.0-5.0 kg) were studied. All cats were anesthetized with pentobarbital sodium. The initial dose was 35 mg/kg ip. Subsequently, anesthesia was maintained with an intravenous drip of pentobarbital. Catheters were ierted in a femoral vein and a femoral artery for intravenous drug administron and monitoring of arterial blood pressure, respectively. A tracheotomy was performed, and a Z-in. segment of each vagus nerve was dissected. The n.erves were cut distally. Subsequent preparon varied depending on experimental protocol. Protocol I. Changes in Ipiratory Off-Switch Excitability in Immediate Post Period In eight experiments a pair of plnum electrodes was ierted in the diaphragm through an abdominal incision which was
Journal of Applied Physiology – The American Physiological Society
Published: Oct 1, 1985
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