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The effects of the GABA antagonist picrotoxin and the glycine antagonist strychnine on the frequency components in sympathetic inferior cardiac nerve activity were observed. Picrotoxin (0.03–1.0 mg/kg) increased power in the 10-Hz component of sympathetic activity and produced a dramatic shift in the rhythm to higher frequencies. Only small changes were noted in the 2- to 6-Hz component. Strychnine...
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