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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/18948

Title: State-dependent Versus Central Motor Effects of Ethanol on Breathing
Authors: Vecchio, Laura Marie
Advisor: Horner, Richard
Department: Physiology
Keywords: sleep
genioglossus muscle
hypoglossal motor nucleus
Issue Date: 16-Feb-2010
Abstract: This thesis tested the hypothesis that ethanol suppresses respiratory muscle activity by effects at the central motor pool and/or by state-dependent regulation of motor activity via influences on sleep/arousal processes. Ten rats were implanted with electroencephalogram and neck electrodes to record sleep-wake states, and genioglossus and diaphragm electrodes for respiratory recordings. Studies were performed following intraperitoneal injection of ethanol (1.25g/kg) or vehicle. The effects on genioglossus activity of ethanol (0.025-1M) or vehicle applied directly to the hypoglossal motor nucleus were also determined in sixteen isoflurane-anaesthetized rats. The results of these studies suggest that ethanol at physiologically relevant concentrations promoted sleep, and altered electroencephalogram and postural motor activities indicative of a sedating effect. The lack of effect on genioglossus activity with ethanol applied directly to the hypoglossal motor pool suggests that the suppression observed with systemic administration may be mediated via effects on state-dependent processes rather than direct effects at the motor pool per se.
URI: http://hdl.handle.net/1807/18948
Appears in Collections:Master
Department of Physiology - Master theses

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