Electrocorticogram in rats loaded with SART stress (repeated cold stress).

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The electrocorticogram (ECoG) in a SART (specific alternation of rhythm in temperature)-stressed (repeatedly cold-stressed) rat, which is regarded as an experimental model for clinical vagotonic-type dysautonomia, was investigated in the present study by the power spectral technique. 1) Analysis of ECoG in SARI-stressed rats during the resting-arousal state indicated a decrease in total power and a decrease in relative power in the δ band, and also an increase in relative power in the θ, α and β bands. 2) In the slow-wave sleeping state, the ECoG of SARI-stressed rats indicated a marked increase in total power, an increase in the δ band and decreases in θ, α and β bands. 3) Electric stimulation of the posterior-hypothalamic area evoked alterations of ECoG similar to those caused by SART stress. ECoG response to electric stimulation in SART-stressed rats was less than that in unstressed rats. 4) Lesioning of the posterior-hypothalamic areas prevented SART stress-induced ECoG alterations. SARI-stressed rats thus appear to be at a higher consciousness level on awakening but to sleep more soundly. They seem to exhibit greater fluctuation in brain activity than normal rats. There is also the possibility that the posterior-hypothalamic area is responsible to some degree for ECoG alterations in SART-stressed rats.
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