Abstract
Stressful or threatening sensory stimulation results in decreased motor activity in some species, a response referred to as “freezing” behaviour. The present study was designed to examine sympathetic and hemodynamic responses during freezing behaviour induced by 90 dB noise exposure in conscious rats. Wistar male rats were instrumented chronically with electrodes for measurements of renal (RSNA) and lumbar (LSNA) sympathetic nerve activity, electroencephalogram, electromyogram, and electrocardiogram and catheters for measurements of systemic arterial and central venous pressure. Rats were exposed to 90 dB white-noise for 10 min. 90 dB noise exposure resulted in an immediate and significant increase in RSNA while LSNA did not change significantly. There was a significant difference in the response between RSNA and LSNA during the 90 dB noise exposure. Sino-aortic denervation (SAD) attenuated the magnitude of the increase in RSNA while it has no influence on the changes in LSNA observed in SAD rats. These data suggest that the arterial baroreceptor reflex plays a significant role in the differential control of RSNA and LSNA during freezing behaviour in conscious rats.
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